I'm not a smoker, have never smoked and don't want to start. That said, I don't mind my friends smoking. Just so long as they're considerate about it i.e they don't blow it into my face and it's not extremely smoky in there then I'm fine with it. By the end of the night I end up smelling like an ashtray so a shower is definitely in order.

Ideally of course, I'd prefer smoke free places of course but I'll put up with places that do allow smoking.

Urban legend is that going on the tube to work and back is equivalent to smoking a cigarette or two just from the amount of airborne crud. If you've ever been on the tube then you'll know what I mean by black snot... Eww... Just think of the stuff that doesn't get caught!