Have a smoke? 抽烟吗？

Have a smoke, will you? 你要抽烟吗？

Help yourself to a cigarette. 请抽烟。

Would you like a cigarette? 想抽支烟吗？

Won't you have a smoke? 不想抽支烟吗？

Please have a smoke. It's a new brand. 请抽烟，这是新牌子的。