Interesting thread. Lemme clarify first that I use the colloquial meaning of the word drug and hence don't mean alcohol or any medically "justifiable" medications. I'm well aware both are classified as drugs, I just don't consider the word "drug" referring to them in informal speech.
FYI I do drink socially, although I don't get wasted anymore as I've both seen people wasted and been wasted myself and don't enjoy the sight of it from either the 3rd, 1st or retroactive PoV. If I'm bored of the company I'm in, I might drink myself until I'm tipsy and/or sleepy, but that's as far as I go. However, with a good enough cause and company, I wouldn't mind getting completely smashed once in a blue moon
Anyway, for a start, my traditional "drugs are bad, mkay?" upbringing kept me off drugs through most of my youth. I've also known my brother as a recreational user (just canabis) for years and from what I've known and seen it didn't have a positive impact on his personality. As I grew up, I've seen the effect of it on some of my peers as well and it simply didn't seem like something I wanted to get into.
Of course, you'll probably notice/comment (and be relatively right at it) that the above was largely due to ignorance and anti-drug campaigns and little due to my own "intellect" or choice. I've since got a bit more acquainted with the subject and listened to both sides of the story, not so much because I wanted to try it (it did cross my mind, but didn't stay there for long), but because I wanted to try and make the decision myself and not just be coached into it as I kinda like being open minded.
I've checked out some science behind the subject, psychology effects, addiction comparisons between different drugs as well as the opinion of some people I considered intelligent enough to speak well for both sides, both IRL and some public personas. George Carlin's interview on it was the best argument I've heard (you can look it up on youtube, think its the interview with Chris Rock) that was somewhat pro-use, but my own experience with and knowledge directly from cannabis users as well as some other reasons/arguments (in a large part, the "bad stuff" mentioned by someone above) from elsewhere just kept me away.
I also consider myself having a highly addictive personality so I'd rather not try and and miss out on a bit of fun than end up completely fucked up. I don't think badly of people who use it recreationally and keep it in check, but I'm not too fond of actual junkies and people who's personality heavily turns for the worse under the influence.
edit:
SnipErlite said:
I occasionally drink, but since that's non addictive I don't usually compare it to all the illegal and addictive drugs.
Iirc is the single substance most addicts are addicted to. While it's not as addictive in itself, the facts that it's common, legal and very socially accepted and even promoted, it's very easy to end up getting addicted to.