I don't do anything like that. Yet, I'm still a fixture at several bars on Friday night during karaoke time. Fortunately, the ownership understands why I don't touch the stuff and they leave me alone.
My aversion to booze, pot and cigarettes started somewhere in high school, where I would hear about wild weekend drinking and sex parties, and I would find myself disturbed beyond reason (Even as an adult, I cannot explain why I used to think this way). And since I was so unpopular through school, I would only view social drinking and marijuana use as something only the "popular" kids did. Since I wasn't popular, why would I want to do anything that they did almost every weekend?
I think I've mellowed out since then, but as a 26 year old, I still don't see why anyone would want to drink themselves stupid, when they can't see, walk, or even think straight. Guess I'm just weird that way...
-Ben