Non-smoker is preferable.

非吸烟者是可取的。

This is a non-smoker section, isn't it?

这里是禁烟区，不是吗？

You cannot ask a non-smoker to give up cigarettes.

你不可能让一个压根不吸烟的人去戒烟。

Every time you feel like smoking a cigarette, remind yourself that you are a non-smoker.

每当你想要吸烟的时候，你就提醒你自己，你(已经)是不吸烟的人了。䕃。

Every time you feel like smoking a cigarette, remind yourself that you are a non-smoker.

每当你想要吸烟的时候，你就提醒你自己，你(已经)是不吸烟的人了。