No option for meth?
I don't smoke unless I'm around a smoker and I've had a couple of drinks. My only encounter with mary jane came after I had four beers and asked for a cigarette. I thought it looked funny when she handed it to me, but I smoked it anyway. I remember feeling really, really relaxed. Then, after I figured it out, I was paranoid I was going to get chosen for Operation Golden Flow. A week later, I was chosen.
Turns out that if you really only smoked once, it doesn't stay in your system that long. It takes some work to keep it at detectable levels.