Jan 052013
 January 5, 2013

marijuana weed drug testing system saliva hair urineThe 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

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.
  • Steven hines

    Well I am 110 pounds and I smoked once how long would it stay in my system for? (Aprox)

  • Tori

    I am a female, approx. 120 lbs, average build, 5’2″ height. Last time I can remember smoking was October 31st. I was drug tested today through urinalysis (December 1st). I’m an occasional smoker. Like seriously I’ll smoke randomly and only a tiny bit. Usually a hit or so then I’m good. I’m doing it for a job and I’m pretty nervous. Will I pass?

    • Tori

      *UPDATE* I passed the urinalysis. :)

  • Joe

    I haven’t smoked in 17 days and I tested myself with at home drug strip four different times and all of them are negative. I had my drug test today, what are my chances of passing the lab test? Oh and I’m 5’7″ 140lbs, good metabolism, and drank green tea on a daily basis.

  • Lily

    Hi I’m 270 pound female. My job is pretty physical so I don’t sit around all day. I took less than 10 hits of a joint. Took a urine test 44 days later did I pass? I didn’t drink a lot of water.

  • guest

    I took 2 hits Saturday night and was drug tested Monday afternoon. It was a surprise. Drank a lot of water during the hour I waited for the test. What are the chances I’ll pass? Still waiting to hear results and very worried.

  • Jessica

    Hi everyone. Im 5’2 and I weigh 110 pounds.
    I rarely smoke, only like 2 hits and im done.
    I smoked in november like 2 times. Will I test positive? Im scared. Im testing in 2 days.

  • hguru

    it’s depends on many factors. most medical testing based on frequent of usage. You can refer to this marijuana usage table : http://prescriptionfact.com/how-long-does-weed-stay-in-your-system/

  • raya

    I am 5’4 and 110 pounds and I have been clean for a while but then I smoked 5 times in the last week, I have a drug test in two weeks. Will I be clean? I have a pretty good metabolism.

  • Rj7321

    Found Out I’m Pregnant, QUIT immidiatly, but I have smoked everyday for about 18 mo, how long till its out of my system!

  • healthguru

    it depend on many factors such as age, weight. most of them are based on usage of weed. I suggest you read this table: http://prescriptionfact.com/how-long-does-weed-stay-in-your-system/

  • bk

    Hey guys im 25 male, 5 ft 10 295lbs, overweight, and do not workout (surprising I know). Im not sure what constitutes a light vs moderate smoker, its been approx 35-40 days since I smoked last, I would usually smoke 3-4 nights a week only taking a few hits 2 hours before bed. for the last 4 months (before that had a job that tested routine) Never smoked during the day. I also have a slow metabolism, but drink 5-6 bottles of water a day normally (just love water). I test 12/5, not sure if I passed yet. Thoughts?

  • dee

    I’m 5’4 110lbs I have real good metabolism. Since the day I stopped Nov.17 I have drank plenty of water. About 96oz a day. I smoked/shared about a gram everyday with my husband. We smoked a blunt every single night. I’ll be 21 in a few days

  • Tman

    I passed one in 3 weeks last year. Prior to stopping I smoked multiple times a day, every day for the majority of 3 years. I just took another for my new job today. I quit for about 35 days. I’ll let you know how I do soon. Same goes as before, I smoked everyday before I stopped.

  • Old guy

    Since may I have smoked about 3 ounces. Two bowls a day prior to going to bed. Been clean about a month. Used a 20 NG/mL kit and came out dirty. 48 years old about 230lbs. How much longer do you think I’m going to be dirty. Company just put a D&A policy in play. Feeling a little leery and concerned

  • Urfriendlyneighborhoodpothead

    Smoked on the 11th like 2-3 blunts and bam test on on the 13th (urine by the way) i get the results on tuesday so how screwed am i

  • Charlies

    I smoked 2 weeks ago and will smoke again in like a week(Bunch of friends are coming to my house), and I am getting drug tested a week and a half after that. What can I do to pass?

  • Ray

    So i rarely smoke and am 6’1 around 140 pounds and i smoked for the frst time in about 4 months and was 1 dab of wax on a gpen so would that be considered as a one time use?

  • Megan

    So I took a test on the 10 and I stop smoking up to 10 days before that and come up positive. I smoked yesterday which was the 13 and took 4 hits and I have a test on January 7 and I have to be clean or I will lose my job. I am 5″5 and weigh 120. Do you think I will pass?

  • elle187

    what constitutes a heavy smoker exactly? I smoked 4-7 days out of the week, anywhere from .5-1.5g each time. how long before I can pass a drug test? I don’t work out but I have an active job and a teenage metabolism