I'm in the same situation as you speeds. My parents tested me after i got in some legal trouble. It had been a week and 5 days since I had smoked and I came up negative, since the last time I smoked, I only did about half a gram, and had smoked maybe 1-1.5 grams every week for about a month. Now I'm being tested randomly every 2-3 weeks. My metabolism's pretty high (I'm 16 and play lacrosse, and used to do cross country and soccer), and I'm 5' 9" and 130, with about 8-10% body fat. I haven't smoked in 2 months, but now after my next test, I'm definatly gonna smoke the day after, but don't know how much I would be able to do safely. Would an 1/8th in one day be safe for me to do if I had 2 weeks to get clean?