How Long Does Marijuana Stay in Your System?

People who smoked marijuana in the last:

  • 30-45 days can fail a urine test
  • 60-75 days can fail a blood test
  • Up to 90 days can fail a hair follicle test

Though the effects of THC, the main chemical in marijuana, wear off within a few hours of ingesting marijuana, traces of the chemical can remain in the body for weeks. There is no perfect formula for determining exactly how long marijuana stays in someone’s system during a urine, blood, saliva or hair drug test.

Factors that Affect How Long Marijuana Stays in Urine, Blood or Hair

Someone who has been using marijuana for many years or who uses it daily is likely to have a build up for THC in their system, meaning it will take longer to leave the body.
Though it’s not always common knowledge, marijuana can have varying levels TCH potency. If marijuana with a higher THC potency is used, metabolites will remain in the body for longer periods of time.
How marijuana is used can have a significant impact on the amount of time it is detectable. If marijuana is smoked, the THC levels in the drug users body will drop within a few hours or days of ceasing use. However, marijuana will still show up on a urine or blood drug test for up to 45 days or more after the last time it was smoked. But if it is ingested, it is metabolized more slowly and will remain detectable longer.
Each and every person who smokes marijuana has a rate of metabolism that is completely different and this can dramatically alter the way the human body breaks down THC, which can very easily change how many days marijuana will stay in the users system or cause a failed drug test. According to the Better Health Channel, “Metabolism refers to all the chemical processes going on continuously inside your body that allow life and normal functioning (maintaining normal functioning in the body is called homeostasis).”
Because the main ingredient of marijuana that causes users to fail a drug test is THC. THC is stored in the body’s fatty tissue. Those with less fat in their body will clear their system of THC faster than those who have more fat. Someone who eats well, exercises and gets enough sleep has a body that will function better, meaning it will detox THC at a faster rate than someone who is in poor overall health.
Certain drugs can affect a person’s metabolism rate, which in turn affects the rate at which THC is removed from the body.

Because of the variety of factors involved, it is difficult to estimate the amount of time that marijuana will remain traceable through testing. The only sure way to avoid the detection of marijuana use is to remain abstinent from the drug.

  • Marijuana itself does not stay in the body for long periods of time, which is why hemp and other marijuana-based products are safe to use and will not cause you to fail a drug test for marijuana.
  • Testing urine is one of the most common methods for determining marijuana use. With a urine test, 9-carboxy-THC is often the substance that is being detected, rather than actual marijuana.
  • When it comes to testing for marijuana use, blood tests are not often utilized. This is because blood tests have a narrow window of time to detect marijuana use. These tests typically cannot detect marijuana use unless the test is done within a few hours of when a person smokes or ingests marijuana, which is when the THC is still in the bloodstream. Unlike urine tests, blood tests do not identify metabolites (9-carboxy-THC) which are the longer-lasting compounds produced by marijuana use. One occasion in which a blood test may be utilized is if law enforcement suspects someone has been driving under the influence of marijuana.
  • Similar to blood tests, saliva tests can only detect marijuana within a few hours of use, and cannot detect any metabolites from marijuana use.
  • Like a urinalysis, testing hair strands can detect metabolites in the body after they pass from the bloodstream to the hair follicle.
How Long Does Marijuana Stay in Your System?
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