I'm completely clean. No smoking, no drugs, no alcohol. I never have, and I have no intentions or desire to start. It's a lifestyle choice, and not a religious thing or anything like that.
Caffeine doesn't seem to have much if an effect on me, but occasionally, if I need to hit a deadline in coding, I'll try in vain to generate extra energy with caffeine, but that's about it as far as drugs go for me.
Well, now there are two of us. My cover story for friends and coworkers is that I have a lethal allergy to alcohol. (I live in Japan -- it is easier, and more socially acceptable, to lie on this question than tell the truth.) When I was younger, I did not want to end up a drunk. These days, even assuming that I would probably not end up a drunk, there does not seem to be anything missing in my life that could get conveniently replaced by alcohol.
Caffeine doesn't seem to have much if an effect on me, but occasionally, if I need to hit a deadline in coding, I'll try in vain to generate extra energy with caffeine, but that's about it as far as drugs go for me.