I've always seen it as a weakness of character to be honest. (Hear me out lol)
I've never taken a puff, so obviously can't speak from experience, but basically, the first time you smoke a cigarette, you don't like it, that's pretty much a given, right? So it must be some sort of peer pressure, or desire to be 'all grown up' or whatever, that drives you to smoke the second one. And so on.
I've never felt the need for that, so haven't ever smoked.
Plus obviously there's the fact you smell. Bad. And all the other stuff. Being young, the health thing doesn't scare me yet, but all the other things, the yellowing, the nasty affects on your skin, the sheer stench, the fact you turn into an arse if you don't get your fix (not applying to casual smokers there, obviously...) and the sheer cost. It just seems so pointless.
Also, in my opinion, it makes women look nasty. Well, if they're hot, they're hot, but they're less hot with a cigarette.