it is no good (smoking).it is no good to smoke为什么不对?

it is no good (smoking).it is no good to smoke为什么不对?
it is no good (smoking).
it is no good to smoke为什么不对?

it is no good (smoking).it is no good to smoke为什么不对?
因为固定用法是 it is no good doing sth
并不是都可以用不定式.

no 该 not

no good doing sth 这是固定搭配 没办法 只能这么用