Killer drug

[supergee]

I have abused a lot of substances in my time, and in fact I got so greedy about it that I can't even do the good ones any more. Of all of them, though, the only one I wouldn't do again is nicotine, the one that got me the least high and did me the most damage.

I learned a while ago that cigarettes have ammonia in them for the same reason that crack does: to make the high more intense and more addictive. Now I find that menthol has a similar purpose.

Thanx to Slate Star Codex