My WebMD Sign In, Sign Up

Ask Your Question

WebMD Answers

120 Characters remaining
120 Characters remaining
  • First, try and keep your question as short as possible.
  • Include specific words that will help us identify questions that may already have your answer.
  • If you don't find your answer, you can post your question to WebMD Experts and Contributors.

Close

Posted: | Report This Report Question |
Q.

How long does marijuana stay in your blood?

Related Topics: Marijuana
 

Answers From Experts & Organizations (1)

General Medicine
Nursing
1,202 Answers
15,223 Helpful Votes
192 Followers
A.
This is a tricky question to answer, because every person metabolizes (breaks down and eliminates) medications and other substances at different rates. Sex, body mass, and other factors also can influence how fast a person clears any given substance from the body. For example, a person with decreased liver or kidney function may metabolize a substance more slowly than someone else.

When it comes to marijuana, the amount you smoke may affect how quickly the active ingredient (THC) may be detectable in the blood for longer periods of time among heavier smokers than among occasional smokers.

In general, blood testing for marijuana (THC) is performed to measure impairment, such as in driving while under the influence cases. Some experts say marijuana is detectable in the blood for up to a week among regular smokers.

Despite the legalization of recreational and medical marijuana in some states, you should understand the effects of marijuana usage on your body, and you should never, ever drive after using marijuana. Reaction times can be severely impaired after using marijuana, which makes driving unsafe for yourself and everyone else on the road.

Please make smart choices about your health!

Wishing you well!

This answer should not be considered medical advice...down arrowThis answer should not be considered medical advice and should not take the place of a doctor’s visit. Please see the bottom of the page for more information or visit our Terms and Conditions.up arrow

Posted:
| Report This Report Answer

Was this helpful?

YesNo

Thanks for your feedback.

18 of 29 found this helpful