Top answers from doctors based on your search:
Disclaimer

how long does thc stay in your hair if you smoke once

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
Dr. Alan Wartenberg
A Verified Doctor answered
A US doctor answered Learn more
A long, long time: depending on how long/short your hair is. When you use many drugs/chemicals, the blood supply to the hair follicle deposits that chemical into the ha ... 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
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 18-year-old male asked:
Dr. James Ferguson
45 years experience Pediatrics
Curious question: Hair grows at a rate of about 1/2 inch a month, and thc that is deposited in the hair will stay in the zone that represents use while it was forming. ... Read More
1
1 thank
A 52-year-old female asked:
Dr. Heidi Fowler
24 years experience Psychiatry
It is anticipated: That there will no longer be a positive hair follicle test this far out.
1
1 thank
A 49-year-old member asked:
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 o ... Read More
1
1 thank
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 35-year-old member asked:
Dr. Byron Law-Yone
54 years experience Psychiatry
Depends..: Chronic use may show positive results for months. It depends also on the length/amount of hair tested and the nature of the test being used. Check thi ... Read More
A 33-year-old male asked:
Dr. Robert Killian
27 years experience General Practice
Hair Drug testing: Drugs you have consumed will be testable in hair samples. They do not leave or diminish. Only with haircuts does the previous exposures go away on ... Read More
1
1 thank
A 33-year-old member asked:
Dr. Donald Jacobson
A Verified Doctor answered
A US doctor answered Learn more
Different answers: I have read that one time use might not even show up. Most answers say that if use is regular, then it will stay for about 2-3 months. One person said ... Read More
1
1 thank
A 45-year-old member asked:
Dr. Alan Ali
Dr. Alan Ali answered
31 years experience Psychiatry
THC: Up to 90 days.
1
1 thank

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