How Long Does Weed Stay In Your Hair?


How Long Does Weed Stay In Your Hair?

How Long Drugs Stay In Your Blood
How Long Drugs Stay In Your Blood

According to a recent Quest Diagnostics survey, 50% of all drug test positives are for marijuana.

This makes marijuana users the most-frequently targeted drug users in the world.

Which is really ironic, since natural weed is the least dangerous of all illicit drugs.

Even worse, marijuana remains in your system a long time – far longer than any other drug.

But exactly how long does weed stay in your body?

If you are facing a drug test soon, this is an important thing to know.

If you’re facing a hair drug test, then it’s by far the most important thing you need to know, because hair drug tests can detect marijuana use as far back as a year!

This page walks you through the answer to this question, based on scientific facts – not urban legend.

If you have any questions or corrections, please post a comment below.

I check comments about once a week.

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Drug Test Detection Times for Marijuana

How far back in time can drug tests detect your marijuana use?

Here is a table that lists reliable detection periods for each type of drug test:

Drug Test Detection Times for Marijuana THC

NOTE: These are just averages, and your experience may vary.

Detection time depends on the kind of test used and the sensitivity of the test process and equipment used (they aren’t all the same).

Other factors that affect the accuracy of a drug test for marijuana include:

  • the frequency of use
  • the dosage/concentration of THC
  • the last date/time of use
  • the user’s metabolism (but not as much as people think)
  • the user’s digestive system (if ingested).

How Fast Does THC Leaves Your Blood, Over Time?

The following chart illustrates the results of two studies that measured the amount of THC and THC metabolite (THC-COOH) in the blood streams of a large number of marijuana users, over an extended period of time.

It shows how blood levels of THC and the metabolite decay, or dissipate, over time depending on whether you smoked or ate your weed/hash.

Please note that this chart displays the average blood levels for a group of people. Each test subject used a different amount of marijuana, and your chart would look different depending on how much and how frequently you used, etc.

Decay in blood levels of THC and metabolites over time
Decay in blood levels of THC and THC-COOH over time

What is interesting about this chart is that it shows:

  • if you smoke weed, your THC blood level will spike quickly then drop below the typical drug test threshold of 50 ng/mL
  • if you eat hash brownies, THC will gradually build over time, peaking at about 4 hours
  • THC-COOH, the metabolite used to detect marijuana use in most drug tests, takes a LOT longer to dissipate.


Hair Test for Weed: How Long Does THC Stay In My Hair?

The hair drug test was developed to identify long-term use rather than one-time or infrequent use.

Hair follicle drug tests can detect marijuana use beginning around 7-10 days after first use.

To do this, test labs use mass spectroscopy and other methods to detect the presence of a non-psychoactive byproduct of THC, a metabolite called THC-COOH. 

The cutoff level that most tests consider a positive result for marijuana use is a concentration of TCH-COOH of 50 ng/mL or higher, in your blood.

One time and infrequent users of marijuana are much less likely to be detected by a hair follicle test.

A 2006 Forensic Science International study, Cannabinoid Concentrations in Hair from Documented Cannabis Users, found that 85% of daily users tested positive for THC use, but only 52% of smokers who used 1-5 times per week were detected.

Eating or ingesting THC also lowers your chance of being detected vs. smoking the same amount of THC.

To learn more about the hair drug test, check out our home page or our Frequently Asked Questions page.

 Learn How To Pass The Hair Drug Test >> 



Urine Tests For Marijuana: How Long Does a Pee Test Detect THC?

The most popular kind of THC drug test is the urine test.  

Because THC-COOH takes such a long time to eliminate from your body, urine tests are more sensitive to marijuana than other commonly used drugs. This is why urine tests are the preferred test for detecting recent marijuana use.

Like hair tests, urine tests look for the metabolite THC-COOH, usually with a cutoff of 50 ng/mL.  Urine tests can detect marijuana for days or weeks after use. They can detect marijuana use for days after the high is gone, even in 1-time users.

The following chart shows the results of a recent study of 1-time users of THC.

Urine levels of THC-COOH for one-time and infrequent users
Urine levels of THC-COOH for one-time users of a standard NIDA cigarette 
Source: M Huestis, Mitchell and E Cone, “Urinary Excretion Profiles of 11-Nor-9-Carboxy-Delta-9-Tetrahydrocannabinol in Humans after Single Smoked Doses of Marijuana,” Journal of Analytical Toxicology, Vol 20:441-52 (Oct 1996).

The most striking thing about this study is how variable the results are – from person to person, and from hour to hour for the same person.

Note that it took Subject B two days to get clean. Subject E was safe the entire time.  Depending on the time of day, Subject G might have passed or failed the 50 ng/mL cutoff.

The reason for this variability is that the concentration of THC-COOH in your urine is highly subject to the amount of water in your body (and urine) and your body’s metabolism.  If you are poorly hydrated or have a low metabolism, you are more at-risk of failing the urine test.

The bottom-line for the urine test is: to be safe, you should assume you will fail if you use any amount of marijuana within a few days of the test.


Blood Tests For THC

A blood test is the most accurate form of marijuana drug test, because it measures the direct presence of THC (delta-9-tetrahydrocannabinol) in your system.

But blood tests only detect drug use back a few days, so they are primarily used in the investigation of accidents and crimes committed under the influence and for spot-testing employees in jobs and professions where any amount of drug influence could be catastrophic.

Blood tests are also ordered in domestic dispute and parole situations, where the court has required abstinence.


Saliva Tests for Weed

In general, saliva tests are not used  to detect marijuana use in the US due to unreliable results.

The main problems with saliva testing for THC, as reported by a large-scale 2006 industry research project, the Rosita Project, include:

  • difficult to obtain enough saliva
  • malfunctioning of devices that read the results

It’s possible, perhaps likely, that the test device manufacturers will continue improving their methods and technologies.


Detection Times for Alcohol and Other Drugs

Urine Drug Test and Hair Drug Test Cutoff Levels and Detection Times


Hair Tests For Alcohol

In the testing industry, the accuracy of the hair drug test for detecting alcohol use or abstinence is hotly debated. In short, the problem is that many common cosmetic procedures can alter the amounts of alcohol-related chemicals that the hair test is looking for.

The hair drug test detects two byproducts of alcohol in the hair follicle, including:

  1. Ethyl glucuronide (EtG)
  2. Fatty acid ethyl esters (FAEEs) including ethyl myristate, ethyl palmitate, ethyl oleate and ethyl stearate

The hair test is not as reliable for alcohol detection as it is for other drugs, because cosmetic treatments can dramatically affect the levels of EtG and FAEEs in your hair. This includes hair straightening, dyeing, bleaching and perming.

In addition, hair products that contain ethanol, such as hairsprays or hair lotions, will affect FAEE levels, though not EtG.

A 2014 survey of 31 test labs held by the Society of Hair Testing concluded that a hair drug test is not, by itself, a reliable indicator of abstinence or excessive consumption of alcohol.

To quote their conclusion:

“It is not advisable to use the results of hair testing for alcohol markers in isolation; all relevant factors surrounding a case must be considered when providing expert interpretation and opinion.”

In other words, the accuracy of the hair test for alcohol is considered unreliable if cosmetic activities are not accounted for.

If you think you may test positive for alcohol use, then you may want to use an aggressive cosmetic treatment or an aggressive hair cleaning regimen like the Macujo method.

 See Step-by-Step Instructions for The Macujo Method >> 


and now we wait for our marijuana drug test


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  1. Kelcey
    April 18, 2016 @ 6:39 pm

    I have a test in exactly one week. I smoked weed on 3 separate occasions 6 months ago. Before that it had been 2 years. My hair has grown out over an inch and a half since I did it and I’ve also bleached my hair since then. What do you think my chances are of passing the test


    • Jay Z.
      April 24, 2016 @ 1:27 pm

      I think your chances of passing are quite good.


    • ty
      March 3, 2017 @ 1:59 am

      curious, did you end up passing this?


  2. Braden
    May 31, 2016 @ 12:11 am

    I smoked about 2 grams 7 days ago and it was my first time would they be able to detect in a hair test of its my first time in 8 days ?


    • Jay Z.
      June 1, 2016 @ 4:35 pm


      Yes, it’s possible. But highly unlikely.

      Best of luck,



      • Mike
        June 14, 2016 @ 10:06 pm

        Ok I am sure this gets said way to often, but here we go. I was really drunk about two weeks ago and took a couple of hits off a joint that one was really small and two wasn’t that strong. Now I know I can pass a UA and I have some job interviews lined up and totally forgot about hair tests how do you think I would fare with that type of test


        • Jay Z.
          June 26, 2016 @ 7:14 pm

          If you only took a couple of hits off of one joint, and that’s all you’ve done in the past 6 months, then you’ll very likely pass the test.


  3. Berry
    June 20, 2016 @ 5:59 am

    I took a hit or two off a bowl and popped a 60mg vyvanse a month ago. Can’t even remember the last time I did any sort of drug. I have a hair test coming up soon, am I good?


    • Jay Z.
      June 26, 2016 @ 7:09 pm

      yes, I think you’re OK.


  4. Alex
    June 23, 2016 @ 10:00 pm

    If I smoke weed for my third time tonight and have a hair drug test in about 80-90 days will they catch it?


    • Jay Z.
      June 26, 2016 @ 7:01 pm

      IF that’s the only smoking you’ve ever done, then you’ll probably pass.


  5. Jane
    June 23, 2016 @ 11:25 pm

    I was a very heavy smoker for months but I quit at the end of January, do you think I would pass a hair test now? I am a 5’3″ 165lbs woman.


    • Jay Z.
      June 26, 2016 @ 7:01 pm


      If you cut your hair to 1.5″ in length (from the scalp, all around) at any time between now and the test, then there’s an excellent chance you’ll pass the standard hair drug test (90 day history).


  6. Ian
    June 24, 2016 @ 5:25 pm

    I have to take a hair test in a week.

    I do not smoke weed regularly at all. I took a few hits exactly two weeks ago and prior to that I smoked a couple of times from a one hitter over the last 90 days.

    How likely am I to pass?


    • Jay Z.
      June 26, 2016 @ 6:58 pm

      I’d say your chances of passing are good. Good luck!


    • Sara
      August 2, 2016 @ 12:18 am

      Did you pass ?


      • paula spigner
        November 1, 2016 @ 9:17 pm

        Did They? Yes? No?


    • Andrea
      February 11, 2018 @ 7:40 pm

      Did you pass??? please lmk


  7. Jackl
    July 16, 2016 @ 12:15 am

    I smoked .5 grams of marijuana about 8weeks ago (one smoke session) will I pass a hair follicle? Havnt smoked since then or before then?


    • Jay Z.
      July 25, 2016 @ 9:33 pm

      Yes, you are probably good to go (should test clean).


  8. drake brown
    July 18, 2016 @ 6:20 am

    I smoked weed quite a few times a week starting this summer and quit about a week ago. I may be hair tested november or december, what are my chances of passing? please help


    • Jay Z.
      July 25, 2016 @ 9:32 pm

      You have just enough time to clean up your act, if you don’t use again.

      On Oct 31, if you cut your hair down to 3/4″ (all over) or less, then you should test clean from that point forward.

      The main issue I see for you is that you won’t have the minimum length required (1.5″) for a standard hair test, until the end of December.

      Hope this helps,



    • Kelley A Carlson
      October 13, 2016 @ 8:16 pm

      I have been a daily cannabis user for years. Preferred method is vaporizing in case that has any impact on this. I quit on/around September 22 in preparation for a preemployment screening. I tested negative dilute on 2 occasions. The perspective employer has given me 2 options…reapply in 6 months under the same terms and conditions or submit to a hair test which if I fail, I would be completely rejected. This job is an amazing opportunity and I really want to secure it, but financially, waiting 6 months seems like forever. Any insight would be helpful…


      • Jay Z.
        October 21, 2016 @ 8:03 pm

        Kelley, if I were you, I’d abstain and wait the 6 months.

        You’re taking a big risk if you quit on Sept 22 and you take the test any time before the New Year.


  9. T
    July 20, 2016 @ 5:51 am

    I hope you still check this, not sure what your background experience is or how you come to the conclusion of whether or not someone will pass a hair test, none the less, I will ask this question for a close friend of mine.

    End of May my friend smoked about 3/8 grams of weed… maybe over a weekend. June my friend did not smoke any weed. However, during the beginning of July, July 1st, he again smoked approximately 3/8 grams of weed over a day or two.

    Now it is July 19… 18 days since last he last partook in any weed smoking.

    When would it be safe to take a hair test? Would his urine test be clear?

    My friend is 220lbs, 5, 10… has some belly fat, works out every other day, drinks between 32-54 oz of water daily.

    Please advise, I think the Hair test is coming up soon!


    • Jay Z.
      July 25, 2016 @ 9:24 pm

      Your friend is a light user, by anyone’s definition. The hair test is not designed to detect this light amount of drug use. So, he should be fine.

      Re. credentials, etc: I am a friend of someone who had to take the hair test. So, I researched the crap out of this subject (see research on home page); later, I built this website to share what I learned with everyone else.

      The math to determine if you will likely pass or not is actually very straightforward – read our home page, especially comments, to learn more about it.


      • Simon
        July 4, 2017 @ 11:01 am

        Hey. I am a 23 year old, skinny and fit.
        I definitely smoke 3 joints at the very least a gram per day, how long does it take for me to get clean?
        I haven’t done a urine test for since I were 16 and were just started.


        • Jay Z
          July 5, 2017 @ 4:42 pm

          You’ll need 120 days of abstinence to grow 90 days of clean hair for the test.


  10. Anthony
    July 20, 2016 @ 11:12 pm

    I smoked 3 times last week and I have a hair drug test next week. Before that I haven’t smoked in almost a year how likely am I to pass the test?


    • Jay Z.
      July 25, 2016 @ 9:17 pm

      Chances are good you will pass. Best of luck!


  11. Rob
    August 14, 2016 @ 1:58 am

    I have a upcoming drug test, I haven’t smoked weed in 4 years. Is there anyway I can test positive for weed? I also have very long hair. Wondering how much hair they will test.


    • Jay Z.
      August 15, 2016 @ 10:39 pm

      No, you won’t test positive if it’s been 4 years. Even with long hair. Make sure they take clip the 1.5″ sample from the scalp outwards (as they are supposed to), and you’ll be fine.


  12. hewitt
    August 16, 2016 @ 12:42 am

    if u smoked twice a month for 6mos, stopped in June, now have to take hair follicle test in aug, will you pass?


    • Jay Z.
      August 18, 2016 @ 10:34 pm

      No, you will probably fail the test.


  13. Granny
    August 25, 2016 @ 7:24 pm

    I am 62 years young, I chose to read an article on THC detected in hair. Very interesting!


  14. Kinda Worried
    September 2, 2016 @ 5:01 am

    I’m surprised at all the comments asking about personal usage and possibility of passing, but even more shocked that you respond to all of them. I’m sure everyone appreciates that.

    Well here’s my dilemma. I stopped smoking for 2 years, so I had absolutely no THC in my system whatsoever. Just recently, over the past week I have smoked 2.5 grams of bud. I’m not even sure that I will have to take a hair test, it may be a urine test.

    Do you think the THC will show in the hair test? If so, I’m assuming I’ll need 90 days to be clean. What are your opinions on probability or even if it will be detected? I greatly appreciate any response. Thank you.


    • Jay Z.
      September 8, 2016 @ 10:10 pm

      I would not be that worried. The hair test isn’t designed to detect one-time use, especially of that small amount.


  15. Rob
    October 29, 2016 @ 5:11 pm

    This my first time being tested using a hair test. Last time I smoked would have been at the beginning of august. I’m not a heavy smoker. Just a social one. They pulled from my under arm hair today which has never been cut. Do you think the test will be positive


    • Jay Z.
      November 12, 2016 @ 4:34 pm

      Yes, you are at risk if they sampled underarm hair.

      Body hair grows much slower than head hair, so it records a far longer period of use, per inch.


  16. Blake
    November 1, 2016 @ 3:15 pm

    I had 2 hits from a pipe over a month ago. This is the only time that I have smoked. What are the chances it shows up on a hair test?


    • Jay Z.
      November 12, 2016 @ 4:32 pm

      Very low risk you will fail the test.


  17. Smither
    November 7, 2016 @ 1:36 am

    Hello there,

    I have smoked on and off (probably a few times a month) over the last couple years. I have long hair, and don’t want to cut it away if I can help it. Do you reckon I could pass a hair follicle test taken mid-late next year? Would it be clean by then?



    • Jay Z.
      November 12, 2016 @ 4:22 pm

      If don’t use any more until then, you should be OK.

      The test station will cut your hair at the scalp line, then cut it again and throw away hair that’s older than the cutoff period (usually 1.5″ for 90 days).

      The risk with keeping longer hair is human error. Sometimes, a sample station tech won’t cut the right length. At the lab, if they can’t tell which end is which, they may be forced to test the whole sample. So, what should have been a 90-day test ends up being a 120-day test.

      That’s why I always recommend cutting hair down to 1.5″ right before the test, just to be sure. But I understand not everyone can do this.

      Best of luck, Smither!


  18. Tim
    November 8, 2016 @ 8:08 pm

    I have amoked for years…I recently quit 6 weeks ago to look for a better job..I have a test comming up in about 2 weeks…Also I have long hair…is it possible to pass a follicle I need to cut my hair? Do I need to wait longer?


  19. Spot
    November 11, 2016 @ 11:36 pm

    I haven’t smoked ib 8mos qn 30 days ago i took a hit of some good weed i hqve a new job opportunity and they hair test will i fail or pass..if i need to wait how long should i wait in what should I do to clean up….if i wait smoked 100days will my hair follicle be clean…… Please help truthful answers only


    • Jay Z.
      November 12, 2016 @ 4:03 pm

      I think you are fine. I wouldn’t worry if you only used once in 8 mos.

      Good luck!


  20. Louise
    November 29, 2016 @ 10:21 pm

    I had to take a hair follicle test today for court to get a base-line level of thc. I am a heavy smoker, and I have smoked just about everyday for the last 3-1/2 years. The judge said that that the levels better be lower in 90 days. My lawyer thinks if I just cut it way down, I can still occasionally smoke and still get my levels to go down. Does that sound right, or would i test completely clean in 90 days if I stopped now?


    • Jay Z.
      November 29, 2016 @ 10:43 pm

      I assume that when the judge says, “better be lower”, it means: “you better pass the test”…?

      If so, then your lawyer is giving you bad advice.

      You should stop cold turkey, right now, to have a chance of passing the test in another 90 days.

      You still may not pass, because a heavy smoker needs at least 110-120 days of abstinence to yield a 1.5” clean hair sample.

      Perhaps that’s what the judge meant (he probably knows how the tests work).

      All the best,



  21. Jay
    December 8, 2016 @ 5:11 pm

    Hello, I smoked regularly for about a year until a great job offer came my way. I stopped smoking around the end of June and have been clean since then. How likely do you think it would be for me to pass a hair follicle test if it is around the end of January 2017? would really appreciate a reply Thank you!


    • Jay Z.
      December 15, 2016 @ 11:14 pm

      Your chances are very good.


    • Jane Doe
      June 8, 2017 @ 3:19 pm

      I have been a marijuana smoker for about 6 years. I have a job opportunity which is requiring a hair follicle test. How long would you say it would take to clean and clear my system. Please help


      • Jay Z
        June 10, 2017 @ 2:44 pm

        To be safe, you’ll need to abstain for 110-120 days before the test.

        Then, right before the test, I recommend cutting your hair down to 1.25″ all around, just to be sure no tainted hair remains. Or, you can use the Macujo or Jerry G cleaning method ( to strip your hair, if you want to keep it long.

        Best of luck on your test!


  22. Luis
    December 12, 2016 @ 6:16 pm

    Hi I haven’t smoked in years but in mid october I took 2 or 3 puffs of weed (joint) and i will have a hair follicle test in end of December or beginning of January what are my chances of passing the test??


    • Jay Z.
      December 15, 2016 @ 11:02 pm

      Your chances of passing are excellent. That is a very small amount.


  23. Jay
    January 13, 2017 @ 6:45 am

    I regularly smoked for the last 2-1/2 years. My normal hair length is 1/2 inch, and I am not sure where they are going to pull the hair from. I am a 39 year old male, body builder, excellent nutrition, and 15% body fat. I have a couple of questions. I am going clean tomorrow in anticipation of an upcoming hair test for employment. I would like to take the test in 2 months if I can pass it.

    1. If they take arm pit hair as my head hair is too short, would shaving it a month prior to the test be effective?

    2. With my high metabolism, daily exercise, and healthy diet, is it possible to have it out of my system to pass a hair test sooner than 90 days?

    3. Are there any detox remedies that I can start using now, that will help the process of removing THC from the hair follicle? A detox shampoo treatment the day / week before the test will not work in this situation. They test randomly while on the road and there is no way to run for a quick shampoo.

    Thanks so much for your help. This job is a life changer, and will really help my family.


    • Jay Z.
      January 14, 2017 @ 4:55 pm


      Since your scalp hair will be 1/2 inch at the time of the test, then there is a good chance they will sample your upper body hair, if they can find enough.

      1. re. arm pit hair: shaving a month before is a good strategy to rid your armpits of traces; however, it also doesn’t leave enough hair to sample

      2. no, your metabolism won’t make much of a difference; your metabolism has very little impact on how fast your bloodstream eliminates/breaks down TCH-COOH stored in your body fat. The fact that you have low body fat helps to some degree, but not nearly as much as people think. After all, 15% body fat in a 200 lb man = 30 lbs of fat containing drug traces.

      3. the only way to rid your hair follicles of TCH-COOH are (1) be clean for ~100 days + cut the bad hair away; or, (2) try to clean your hair using the two methods mentioned above. I’ve seen no credible evidence that edibles, pills, drinks, etc. make much of a difference on a hair test.

      Best of luck on your test!



  24. Zach
    February 20, 2017 @ 4:54 am

    Smoked less than .5 grams total on January 1st and 2nd in Denver. Might have a hair follicle test in mid-March or late March. My hair is about 1.5″ right now. Will I pass the test? I don’t use regularly, 1 other time in early December, then nothing before that.


    • Jay Z.
      February 21, 2017 @ 5:00 pm

      You’ll probably pass, is my guess. But kinda cutting it close.


  25. Sam
    February 28, 2017 @ 8:26 pm

    I’ve been 500 days clean will I pass? Did a bit of mandy before that too



    • Jay Z.
      March 1, 2017 @ 4:53 pm

      I can’t see how you could fail, after abstaining this long.


  26. Douglas P.
    March 8, 2017 @ 10:22 pm

    The last time i smoked was in October of 2016. Took a hair sample from my armpit the 1st of March 2017. FAILED! The lab that did the test was Quest Diagnostic.


  27. Bella
    April 5, 2017 @ 11:15 pm

    Hi Jay
    Just wanted to say love the site it helped out a lot.
    My story. I am not a heavy smoker just occasionally here and there. In October last year on my birthday I smoked and on three or four days after but not real heavy I quit smoking the first week of November Cold Turkey haven’t smoked since then. Well fast forward 5/30 I was hair tested it was last Thursday and I passed just found out today. I have to say even though I kinda knew I would I still was not sure and the wait to find out was excruciating….lol the just not knowing has my hair grown out enough, has enough time passed etc. I just wanted to say to anybody who reads this I know shit happens on the fly but if you can and have time just quit give your hair time to cleanse naturally instead of the other things I have read here. I’m gonna say it was 4 1/2 months no smoking and even before that only occasionally so yeah oh and my test was with Pschmedics the name alone is intimidating right, let me tell you I knew, but I didn’t. I came here and read every day to try and gauge no lie. I just wanted to share and say good luck. I know Y’all know what time it is, yeah…lol


  28. AJ
    April 26, 2017 @ 8:10 pm

    Was just informed I’ll be getting a hair test within the next 2 weeks. I haven’t smoked since around new years, however I took 2 hits off a small joint on easter. I am 5’5 and 115 pounds. Will I pass?


    • Jay Z
      May 10, 2017 @ 4:25 pm

      Yes, I think you will pass. That’s not enough to register.


  29. Johnny
    May 2, 2017 @ 1:46 am

    Hi J!

    I have been a daily “vapor” of 250mg of THC. Been doing this everyday for the past 2 years. I may have a test coming up soon for a promotion. I quit on March 21st. My hair is a few inches long now, but I usually keep it cut very very short. If I shave my head, how long would I need to wait to get the follicle test and pass? I know for sure 1.5″ cut from scalp would fail me now. I’m about 190lbs, 5’9″, not super chunky, but couldn’t hurt to loose a few pounds. Is the normal, shave now and wait 100 days where I am? what if i shave now, would that help at all? Or do I need to wait longer to shave my head? Thank you so much for your input, I had no idea they would do a hair test, as they have only gave me UAs to pass (which is easy since the lab doesnt watch you piss) previously. No other drugs involved.


    • Jay Z
      May 3, 2017 @ 4:14 pm

      You are a moderate to heavy user, by drug testing standards. So, you’ll need to abstain 120 days, then cut your hair down to 1.5″ (for a 90 day test) to pretty much guarantee you’ll pass.


  30. Mike Hecker
    May 11, 2017 @ 1:39 am

    Hi there, I am seeking advice and a possible plan of action for a hair test.
    I am in the market for a new job, and my father works at the local steel mill. They have a family preference and my dad has crazy good sources high up the chain (Union presidents, company bosses).
    I want to apply, but I only stopped smoking 2 weeks ago, April 27th. Now I know I have all the time in the world to apply, but I need 100% certainty I’ll pass the follicle test.
    I am 22 years old, 6′ tall, and around 290 pounds. I am rather large, but in all around good health. My hair right now is 2 inches long at the longest.
    Now I was a quite heavy smoker up until I quit, smoking a few times a day, everyday, for around 6 months or so.

    With all this being said, could I have clean hair in 3-4 months, after cutting it all now, or is there going to have to be a longer wait?

    Sorry for the wall of text, I can’t find a lot of information with cases like mine online
    Thank you so much in advance


    • Jay Z
      May 12, 2017 @ 3:30 pm

      Body weight and metabolism don’t make much of a difference, when it comes to the hair drug test.

      Given you were a heavy user, I’d recommend taking the test no less than 120 days after your last hit.

      Right before the hair test, shave your body hair off and cut your head hair down to 1.5″ all around – just enough to provide a 90-day sample for the test.

      Good luck on the job!


  31. Thom
    May 27, 2017 @ 2:43 pm

    I ate a brownie and had a couple of short puffs from a pipe over a 3 day span over 30 days ago. Prior to that it has been well over 90 days since I’ve eaten or smoked. Very infrequent user. Have a hair test coming up in a couple of weeks. Ordered a home test to make sure, but what are my chances of testing positive. Also, I am bald on the crown of my head and keep what hair I have on my head very very short. So likely they will take from my arm, armpit or leg.


    • Jay Z
      May 28, 2017 @ 3:02 pm

      Close to the edge. Having short hair usually helps, but your recent use is the issue because it leaves you with <35 days = <1/2 inch of clean hair on your head, at the time of the test. You might want to think about treating/stripping your hair and trimming your body hair down, to be safe.


  32. AG
    May 30, 2017 @ 4:42 am

    I smoked in mid March a hit or two. Then I stopped until last week May 22 I eat a gummy and smoked weed with oil on it (for the first time) since March. I got a job and they are going to do a hair test. Will I be Ok? or should I turn the job down? And if it comes back positive can they tell my other company I work for?


    • Jay Z
      May 31, 2017 @ 2:57 pm

      You are close to the edge of pass/fail, esp. if you are petite.

      No, one employer cannot tell another one about the results of your drug test. It’s confidential.


  33. Miguel
    May 30, 2017 @ 5:16 pm

    I have to take a hair test this week. I rarely smoke but I took two hits off a bong at the beginning of April and ate an edible around February. Should I be worried about failing? Thanks


    • Jay Z
      June 1, 2017 @ 2:55 pm

      I wouldn’t be too worried.


  34. Anton Nguyen
    May 31, 2017 @ 7:49 pm

    Hello Jay!

    I have not smoked any weed in 3 years, but this summer i am going on a vacation to amsterdam where i plan to smoke alot during the 7 days im there with a few friends. After that i will not be doing any more. The thing is; i will be having a blood, urine and a hair test around 8-9 months after my trip to amsterdam. What are my chances at passing these tests?


    • Jay Z
      June 2, 2017 @ 2:52 pm

      Your chances of passing are excellent. To be extra-sure, cut your hair to less than 2.5″ in length, all around.

      Have fun in Amsterdam!

      Heads up: the laws there changed recently, and the coffee shops no longer serve non-Dutch citizens (wink wink).


  35. mex
    June 11, 2017 @ 5:10 pm

    last time i smoke was 8 months ago will i be good for a hair drug test


    • Jay Z
      June 12, 2017 @ 2:38 pm

      Yes, you should pass with no problem.


  36. Very light User
    June 12, 2017 @ 7:38 am

    I smoked once and sometimes twice a week, not heavy very light usage, in the month of May 2017. Kind of for the whole month. I also smoked two times, on two different days at the end of the month. Before that its been 5 years since I smoked. I have a hair test coming in about a week or 3 weeks. I also took a UA the other day and it was negative. Do you think I will pass the hair test?


    • Jay Z
      June 15, 2017 @ 2:35 pm

      I think that right now, you are at a high risk of failing a hair test, without doing something to mitigate.


  37. TJ
    July 25, 2017 @ 12:37 pm

    I used a sativa based coffee for three days. The Total over three days was maybe one ounce or slightly over one-ounce maybe 1.50 OZ of coffee. The coffee ingredients are 80 mg THC and 3mg CBD in a 4.20 oz bottle. I have not used any THC for a year. Prior to that, I used Marijuana 7 times last summer over 3 months July-Sept. same coffee drinks one oz at a time and prior to that no use for 10 years. How long do you think – 1.5-ounce coffee drink from this past weekend stay in my system and hair? How long do you think it will take for me to pass Blood, urine and hair tests? thx!


    • Jay Z
      July 27, 2017 @ 2:20 pm

      I think you’re probably safe. Two reasons:

      1. Ingesting THC is less risky than smoking the same amount, because THC metabolizes more gradually when eaten/consumed. This means the maximum concentration of THCOOH deposited into/onto your hair will be lower than if you smoked the same amount.

      2. You consumed a small amount (20-30 mg).

      Wishing you the best on your test…


  38. MT
    July 28, 2017 @ 2:31 pm

    I appreciate your posts. They are very helpfully. Between May 4 to May 6 I ate four cookies while out in Colorado on vacation. It was my first time and I have never smoked. I have a hair test on August 2. Should I cut my hair to be safe? If so, how long? Thanks.


    • Jay Z
      July 29, 2017 @ 9:45 pm

      No, don’t cut your hair. You should be fine.


  39. allen smith
    August 3, 2017 @ 1:00 am

    i was a regular smoker an drink beer. 2 months ago i quit smoking bud for a new job coming up. im 5’7 170 lbs and cut my hair to 1/8 inch today. my hair grows fast about a inch a month. how long should i wait to take the hair test, and is the new hair growing now have any thc in it? thank you


    • Jay Z
      August 4, 2017 @ 9:57 pm

      Yes, it is highly likely that all of the hair on your head is clean and will test negative for THC.

      Let it grow out for about 90 days more, before taking the test. This is so the lab will have the minimum length they need, to pass you.


  40. Sarah
    August 16, 2017 @ 11:53 am

    Hi there! I am a pretty light smoker and had an edible back in June and smoked 3 times in July. I haven’t had anything since and was planning on taking my hair test in 6 months. Do you think that’s a long enough wait time? I also never cut my hair :/ could I possibly schedule it sooner or wait the 6 months to be safe?


    • Jay Z
      August 17, 2017 @ 9:51 pm

      If you continue to abstain for 6 months, then, yes, you should pass the test with no issues. All the best!


  41. christopher candelaria
    August 26, 2017 @ 4:38 pm

    I smoked regularly and stopped for a month and a week, I cut my hair but not all the way off, and I have a hair follicle test coming up soon, I am fit and easily sweat a lot and work out daily, do I have a chance of passing a hair test under these ocnditions


    • Jay Z
      August 27, 2017 @ 9:33 pm

      You probably won’t pass, sorry.

      Also: How fit you are… and how much you work out… will not help you pass a hair drug test. The record of prior drug use is already stored in your hair.

      Right now, new hair growing through your scalp is drug-free.

      But you’ll need 2-3 months more hair to grow, before you’ll have enough clean hair to sample (1.5″).


  42. Cody
    September 21, 2017 @ 10:55 am

    Hey Jay,

    So back on may 20 i was out and a girl had me try a vap, turns out it was THC oil. I didn’t know. Never smoked before. Its been about 125 days since, I have a hair test coming up in the next week. Last time i did the the test like 2 years ago for another position i used my chest hair, i don’t have a lot of hair on my head. Now I had my back waxed may 31 for a vacation ordeal hair has grown back. Do you think its safe to use my back hair for test or hope I have 1.5 inches on my head.


  43. Aj
    October 5, 2017 @ 6:28 pm

    So I just stopped smoking about 3 days ago and I have a hair test in exactly 3 months what do I do


    • Jay Z
      October 9, 2017 @ 9:08 pm

      Here’s what I would do:

      Cut your hair down to 1″ or less in length, all-around your head. Do this a couple of days before the test. Also, shave your body hair off, including underarms.

      The hair on your head should be clean for the test, although it won’t be long enough to satisfy a full 90-day look back test.

      That said, sometimes the lab will take what they can and call it a day. If not, then they may ask you to come back in 30 more days – in which case, you’ll be clean.

      Good luck!


  44. sue morrison
    October 14, 2017 @ 4:55 pm

    Can you fail hair folicle test if you are around users but you dont smoke weed i was wondering someone said you can fail by be around it or do you have to smoke if they smoked couple times could they fail


    • Jay Z
      October 16, 2017 @ 9:24 am

      NO, you cannot fail a hair drug test if you do not ingest/inhale the drug yourself. Second hand smoke will not cause you to fail.


  45. Chris
    November 7, 2017 @ 3:41 am

    Hi, question for you. I was a regular user (a few times a week) for about two years, but quit in May-5 months ago. I have smoked about 4times since August. The last time was in AMS on honeymoon. That was about thirty days ago. I got a new job and I have to get a hair test next week. I have pretty short hair, and could cut it shorter. You think I’m at risk? What could I do to strengthen my chances?


    • Jay Z
      November 8, 2017 @ 6:46 pm

      Yes, unfortunately, you are at risk of failing. Best of luck.


  46. Chris
    November 20, 2017 @ 5:35 am

    If I quit cold turkey Aug 28 (heavy smoker), shaved my head 6 weeks later. What’s the odds of passing after new years? It will be 126+days clean


    • Jay Z
      November 21, 2017 @ 10:35 pm

      Your odds of passing are excellent. Good luck!


  47. Oskar
    December 16, 2017 @ 12:10 am


    I smoked 2 joints on july 15 and have to take a hairtest for a job. I am a first time user and wonder how long I have to wait until I am safe?


    • Jay Z
      December 18, 2017 @ 9:33 pm

      You are probably OK right now. Two joints total isn’t much.


  48. Mike
    December 21, 2017 @ 3:31 pm

    Was a every day smoker,but haven’t smoked in 90 days. Got a test in two weeks. The test goes back 90 days but I’m a black man with thick hair, and still a little worried.


    • Jay Z
      December 23, 2017 @ 10:08 pm

      You are right on the edge. Dark/curly/thick hair is more at risk when it’s been only 110 days since your last use – but just barely. If you can take a little off the ends, you’ll fare better.


  49. Mike C
    January 27, 2018 @ 11:24 pm

    Hi Jay,

    ‘m a 57 yo guy who smoked about an ounce a month for 6 years and quit cold turkey on June 10, 2017. I shaved off all body and head hair 45 days later. I’m going to try to get a commercial drivers license and the company requires a hair follicle test. I keep my bald head too closely cropped for a scalp hair test, but have adequate facial and chest hair for testing. By the time I get to the test 9 months will have passed after quitting. I would very much appreciate an idea of my chances for passing and or any further advice thereof,


    • Jay Z
      January 30, 2018 @ 11:55 am

      You’re good to go. Just don’t smoke again before your test.

      Good luck w/ the new job!


  50. Jack93
    February 4, 2018 @ 1:01 am

    I’m a guy, height 6’1, weight 180 pounds with a high metabolism.
    I take around 1-2 real small bong hits a week. Am I considered a regular or one-time user?
    If I stop smoking immediately and have a hair test in 1 month, will I be alright?
    Thanks in advance.


    • Jay Z
      February 6, 2018 @ 1:06 pm

      a) you are a ‘moderate user’
      b) you are at a high risk of failing, given your pattern of use and only 30 days to go


  51. Ryan
    February 8, 2018 @ 5:17 am

    Jay Z

    I was looking to see if i needed to use the macujo method but after reading all this useful information from you helping all these people i realized that i was fine and ill pass the test.
    I just want you to know that i greatly appreciate you for helping me and all these other people on this website. I got so much respect for you man.

    Much love. <3


    • Jay Z
      February 10, 2018 @ 12:10 pm

      Thanks Ryan! Yeah, those are my favorite answers of all…


  52. Victoria
    February 12, 2018 @ 7:58 pm

    If I smoked a cigarette that had a little bit of weed in the end of it about 2 weeks ago and before that I haven’t smoked for around 2 years will I be okay to take a hair follicle test in a week? thanks


    • Jay Z
      February 16, 2018 @ 11:19 pm

      Victoria, you’ll be fine. That’s not enough to register on a hair test. Best of luck!


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