Hi all I used to be a big time pot smoker for years but not anymore. However its been years since I last smoked and took a hair follicle test last week. I passed without using anything at all just perhaps exercising. Also keep in mind that I was around 2nd hand smoke that I thought was enough to get me high but everything came out fine. My hair was about an inch and a half long at the time of the test. Hope this helps..