Why should we stop smoking?

I think it is ok!

Here are my ideas:

As such tabacco is harmful for your health

OR

Smoking is harmful for your health!

对的,没有语法错误

the smoke作名词是不可数吧 smoking也可以，作动词

应该是：Because smoking is bad for health.

基本上是对的
但应该是 BECAUSE SMOKING IS BAD FOR OUR HEALTH.

不过想法是对的 :)

想法对，但是 smokes 用的有写不妥当。
Because smoking is bad for health.
or
Because the people who smoke are not healty.