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How Long Does Weed (Marijuana) Stay in Your System?


Weed, also known as marijuana or cannabis, is usually detectable in bodily fluids for 1 to 30 days after last use. As with other drugs, it may be detectable in hair for several months.

detection windows depend on how much you smoke or ingest, as well as
how often. In general, higher doses and more frequent use are associated
with longer detection times.

For daily users, cannabis may be detectable for several months after last use. The longest-reported detection times are more than 90 days.

Read on to find out the detection windows for cannabis in urine, blood, saliva, hair, and more.

How long is it detectable via drug testing?

tests measure weed and its by-products, or metabolites. These
metabolites remain in your system long after weed’s effects have worn

Urine testing

According to Mayo Clinic Proceedings, weed is detectable in urine for the following amounts of time after last use:

  • Occasional users (up to three times a week): 3 days
  • Moderate users (four times a week): 5 to 7 days
  • Chronic users (daily): 10 to 15 days
  • Chronic heavy users (multiple times a day): more than 30 days

metabolites are fat-soluble, which means they bind to fat molecules in
your body. As a result, it can take some time for them to leave your

Urine testing is the most common testing method.

Blood testing

According to an article in Therapeutic Drug Monitoring,
weed is typically detectable in the blood for 1 to 2 days. However, in
some cases, it’s been detected after 25 days. Chronic heavy use
increases the length of time that it can be detected.

Weed is
detectable in the bloodstream within seconds of inhalation. It’s
distributed to the tissues. Some of it is reabsorbed in the blood and
broken down. Its metabolites may remain in the bloodstream for days.

Blood testing may be used in laboratory settings or to indicate recent use of weed.

Saliva testing

According to a 2014 review on cannabinoids in oral fluid, weed is detectable in saliva for the following amounts of time after last use:

  • Occasional users: 1 to 3 days
  • Chronic users: 1 to 29 days

can enter the saliva through smoking and exposure to smoke. However,
its metabolites are only present in saliva when weed has been smoked or

In jurisdictions where weed is legal, oral fluid may be used for roadside testing.

Hair testing

Hair follicle tests assess drug use for up to 90 days.  After use, weed reaches the hair follicles via small blood vessels. Trace amounts may remain in the hair.

hair grows approximately 0.5 inches per month, a 1.5-inch hair segment
taken close to the scalp can provide a window of weed use for the past
three months.

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