A 49-year-old member asked:
Disclaimer

how long does thc stay in your hair?

2 doctor answers
Dr. Heidi Fowler
24 years experience Psychiatry
It may be detected: In hair follicles for months. In “pharmacokinetics of cannabinoids” by mcgilveray ij it is stated “hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week).
Answered on May 18, 2020
1
1 thank
Dr. Linda Callaghan
52 years experience Addiction Medicine
Up to 3 months.: If a regular user, it can still be detected in 3 months.
Answered on Jan 9, 2019

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
Unlimited visits
$10/month

Related questions:

A 18-year-old male asked:
Dr. Matt Wachsman
35 years experience Internal Medicine
Hair has no blood: So, once THC is in the follicles there's no way for it to get out. It stays in the hair until it is cut and grows out.
A 33-year-old member asked:
Dr. Donald Jacobson
A Verified Doctor answered
A US doctor answered Learn more
Marijuana and hair: 90 days.
A 22-year-old male asked:
Dr. Yash Khanna
56 years experience Family Medicine
Longest window of de: Hair test offers the longest window of detection.That is 90 days in a standard test test does not detect the amount but presence of thc.The testing me ... Read More
A 22-year-old male asked:
Dr. Yash Khanna
56 years experience Family Medicine
Longest window of de: Hair test offers the longest window of detection.That is 90 days in a standard test test does not detect the amount but presence of thc.The testing me ... Read More

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
Unlimited visits
$10/month