1.Have a smoke?
2.Would you like a cigarette?
3.Cigarettes?
4.Let's go have a smoke.
5.Do you smoke?
6.Cigar or cigarette?
7.Would you like to try one?
8.Could you put that out?
9.This is a nonsmoking area(building).
10.I'm sorry, but you'll have to step outside.
11.I'am sorry, the smoke is bothering me.