U.S. doctors online nowAsk doctors free
A 26-year-old male asked:

I used to smoke marijuana daily and i was told a hair drug test goes back 90 days. my hair is a little longer than an inch and by the time the test comes around i will be 103 days clean. is this a sufficient amount of time to pass the test?

1 doctor answer1 doctor weighed in
Dr. Theodore Davantzis
Dentistry 42 years experience
Hair grows on average about 1/2 inch per month. But everyone is different. So if you're average, you've got 60+ days of hair on your head. Cut it back to an inch and you may just pass your test.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Jul 29, 2021


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.