A: Let me remind you that smoking is bad for your health.
B: I know. I was not born yesterday.
A: Then why don't you stop smoking as soon as possible?
B: OK. Let's talk about it some other time.

A: 让我提醒你，抽烟有害健康。
B: 我懂。我又不是昨天才出生的。
A: 那么你何不早日戒烟呢？
B: 好啦。再说吧。

重点解说：

★ smoking「抽烟」No Smoking「禁烟<标语>」车中有些贴有"Thank you for not smoking.的贴纸。「戒烟」英文说成stop [quit] smoking。

★ be bad [good] for the health 「有害[益]健康」

★ I was not born yesterday. 「我又不是昨天才出生的。」此语用于表示自己不需要对方叮咛也懂，带有嫌对方多事的味道，近于中文的「我又不是三岁小孩。」

★ some other time「改天」相关用法如： Maybe next time.「下回再说吧。」