Jan 052013
 January 5, 2013

Pass Your Test The data used to create this infographic is gathered from research on drug testing methods and the information presented by drug screen manufacturers. Some resources include Redwood ToxicologyCannabis Drug Testing,California NORML. The information presented is only a guide or estimate since drug testing has many variables that can influence a positive or negative outcome.

How Long Does Marijuana Stay in your System? is the most frequently asked question that we receive at HomeHealthTesting.com. While there is no definitive answer, we have presented some guidelines. The only way to really know if you are positive is to test yourself. You can test yourself with a cheap drug test and know if you are positive. Buy a THC urine drug test

How long does THC stay in your system?

The most common drug tests used are urine, saliva and hair. Each test has a different detection time which is important to know. The urine drug test is the most commonly used because it is cheap and has a longer detection time than a saliva test. There are several very important factors that can influence how long THC will be present in your urine:

  • Weight
  • Body Fat
  • Amount Used
  • Frequency of Use

Since these factors will vary greatly for each individual, there are no definitive guidelines to tell you how long you can test positive for THC.

On a Urine Drug Test, THC will appear as a positive within 2-5 hours of use. How long it will still show on a urine drug test is estimated based on frequency of use, but does not take into account the weight and body fat of the marijuana user:

  • One Time User may show positive for 1-6 days
  • Moderate User may show positive for 7-13 days
  • Frequent User may show positive for 15 or more days
  • Heavy User may show positive for 30 or more days
  • Some Heavy Pot Smokers have reported being positive 45-90 days after quitting

On a Saliva Drug Test, THC will test positive within one hour of use, but may only show positive for about 12 hours after last use.

On a Hair Drug Test, THC will show up about 7 days after use and most hair drug tests will test for a 90 day period. However, THC does not always bind to the hair follicle which makes it not always considered an accurate testing method for marijuana use.

The most reliable way to know if you are testing positive for marijuana use is to drug test yourself.

how long does weed stay in your system
By: HomeHealthTesting.com

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About Johnny Green

Johnny Green is a marijuana activist from Oregon. He has a Bachelor's Degree in Public Policy. Follow Johnny Green on Facebook and Twitter. Also, feel free to email any concerns.
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  • John Pacheco

    Ok I may be unique then. January 10 of 2015 I stopped smoking and by March 2 I took a drug test and was clean. Later on i failed a drug test at work in November of 2015 and was suspended. So I stopped in NOV and had to do a rehab program for 5 weeks. I never did smoke anymore but continued to fail. Now it is march of 2016 and I took a test on the 9th and just got the results back yesterday and I tested positive again. I believe I’m well past the 90 day mark. I am just really frustrated.

  • numbskull

    Hi so I have a question I 5″9 and 139 pounds and I stopped smoking for 3 weeks before my test and it got sent to a lab for further testing am I going to come up positive or negative I have a very high metabolism and can eat non stop and gain nothing at all

  • numbskull

    I have a quick question I was a heavy smoker then went to a frequent smoker then trickled down till I didn’t smoke at all and I haven’t smoked for 3 weeks I took a drug screen today and it was sent to a lab for further testing for the first week of not smoking I was drinking about a gallon of water if not more a day also taking detox baths and making my self sweat a lot then slowed down on the water and I weigh 137 and I am 5″9 and have a very high fast metabolism is my drug screen going to come up positive ??

  • Andrew

    im 5/7 about 175 lbs i been clean 9 days and i would smoke a bowl or 2 a day before i stoped. i have to take a test for a job this comming monday. will i be able to pass? i dont exercise very much if at all. would u consider me a frequent user? please message me back and let me know what u think. thank u. oh and i been drinking alot of water and about every other day beer. beer makes me piss alot, do u think that helps a little bit?

    • Christina Arena

      Did you pass?

  • Sergei Smolya

    How long marijuana stays in your system?

  • Kristy Weiler

    I wanna hit a blunt about 3-4 times.. I haven’t smoked in about 8 months.. today is the 3rd and I don’t text till the 20th I’m about 5’3 130 pounds.. should I be ok for my test on the 20th?

    • CaliforniaGrown818SFV

      You have to test on 420 lol..If you already hit it then be sure to run, make sure you sweat and drink a lot of water… every time you pee you are releasing toxins from your body so the more you pee the better.. but I would just wait.

  • Rookie

    im 5’10 and 170lbs i smoked an 1/8 over a 4 day period 7 days ago and failed a home first check test.

  • Jay ⚡️

    You should be ok kristy it’s been 8 months you got nothing to worry about

  • Dan

    I been smoking for 1 year how long will it take for me to clean my system

  • mamajama

    Help I am pretty overweight female, ate a cookie 10 days ago and smoked like 4 hits 12 days ago. Haven’t smoked in 2 months before that have a piss test tomorrow. Any thoughts? I have been working out and eating good for the last 6 days.

  • Boss

    Hey i testex positive for marijuana in a 12 panel hair test my level was 0.13pg/mg i havent smoked over a year but the real question i wanna ask i how long will it take for my hair to be clean im going with the second hand smoke thing ive passed multiple urine tests sincr then so im not sure on how i tested in my hair is that alot or would it be gone rather quickly

  • dalton

    i am 13 and have smoked about around 20 times but havent smoked in nearly 10 months. I get drug tested on the regular but am leaving the country for about a week and am planning to smoke the day i leave. a test could come any day starting when i get back. will I be ok?

    • Rich

      What are you doing smoking pot at 13? Have you heard of gateway drugs? Im 52 years old. Started smoking pot in 8th or 9th grade, by high school was snorting speed, then cocaine in my early 20’s, then in my early 30’s meth. Was addicted for 10 years have been clean now for 16 years. My advice, extinguish that joint, find a new group of friends who don’t even ‘dabble’ in any drugs of any kind. My lifetime drug use has cost me a lot. Not only money but time with my family. I missed out on the whole high school experience of dances, football games, etc. I was too stoned to want to do anything. I look back now and really regret the things I missed out on in my younger days. I know it all sounds cliché, but a life of drug use IS cliché. Most people with the same patterns. I was ‘lucky’ enough to never have gone to jail, but maybe if I had Id be in a better place in my life now, if something had caused me to quit everything earlier. Now my kids are alcoholics and drug users because of the way I raised them. This I regret the most. When i was using drugs, I was telling them not to. When they found out what I was doing, they went to a bad place. No trust for me anymore. 3 lives and others wrecked by drugs and alcoghol.
      Best of luck to you. Your future is in YOUR hands.

      • Kyle

        Lol you just have no control of your self, I’ve been smoking weed for years since I was 12 and have had no inclination to do any other drug

      • Honeycheese

        The gate way drug is Nicotine not weed. It’s true. The surgeons I work with Taught me that and it’s been documented.

  • Jody

    I have a job that does random drug testing but hadn’t tested me in the 3+ years I’ve been employed so I got a little careless. In December I took a hit from an apple (literally one hit because it burned), then took about two puffs from a Joint at the end of January. Then smoked from a pretty potent joint Feb 13th (Did two shotguns and probably hit it another 2-3 times). I had a random drug test April 14 (61 days after my last smoke) and have been NERVOUS waiting on the results.

    Based off of the info on the internet I should be fine my issue is- I am prescribed adderall so I know I’ll test positive for amphetamines (which isn’t a problem). My question is- once I test positive for amphetamines and they confirm with the GC/MS test will they test me for EVERYTHING on that panel? I’m sure I’ll pass the initial test at 50ng/ml but am worried I won’t at the lowered 15ng/ml.

    Please help anyone who knows the secondary testing procedures! I’m going crazy! (and never smoking while I’m employed with this job. It’s so not worth it!)

    • JKG110

      take it from a pot head YOU WILL PASS IT if you never smoke and take a few hits you got it. you have been clean for a month so you will be fine

  • Jon

    So I am going to be drug tested on May 5 for an internship that I have, and they didn’t say exactly what type of test it would be, they just said “drug screening.” The last two times that I smoked was March 18 when I took a really fat dab, and then on March 3 when I took a few hits from a bong. Before that in January and February I was smoking about twice a week a mixture of bowls and dabs. I am 5 foot 11, 165 pounds male. Will I be able to pass this test? I am pretty nervous about it. Any advice/feedback would be helpful. Thanks!

  • Amanda

    Is it absolutely true about 12 hrs for the saliva test? i’m a heavy user and the test is in two days.

  • Carter

    So I have a drug test on May 5th and the last time I smoked pot was April 18th and again on the 19th, but before that it had been almost a year since I smoked. Is it likely that I will pass my urinalysis?

  • emily

    I have a saliva test tomorrow and the last time I smoked was April 8th so about 3 weeks ago should I worry?

  • Nia

    I smoked weed for the first time about 2 months ago and it was just one small puff, will it come back positive?

  • Elvira Perez

    I’m not a big smoker. But when I do it’s once a while. I weight 123 and last time I smoke was 2weeks ago. I have a drug test on Monday, am I gonna pass the drug test.

    • Tahir Hanif

      I’d say easily