It's been exactly 3 weeks since the last time I smoked. I smoked about a dub the week before I started my clean streak. I play sports all the time... I'm 5'7" and 130 lbs (and I think a pretty fast metabolism). I keep myself well hydrated and followed a lot of tips on these boards. Prior to smoking 3 weeks ago I was clean for about 3 and a half months. What are my chances?