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A 26-year-old female asked:

if you smoke marijuana regularly how long does it take to not be detectable in hair follicles?

1 doctor answer7 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Depends: THC is detectable in the urine for up to three months in chronic users. If hair is tested, the hair that grew out for up to three months after quitting may show THC.

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Last updated Jan 19, 2017
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