勿吸烟的英文：
no smoking!

smoking是什么意思：
n. 吸烟
adj. 允许吸烟的
v. smoke的现在分词；吸烟

to billow the smoke
使浓烟滚滚

Most people who smoke began smoking in their teens.
多数烟民从十几岁时就开始抽烟了。

Would you prefer the smoking or non-smoking section?
你想要吸烟区还是无烟区的位子？

There was a drift of smoke above the trees.
树林上空飘浮着一股烟。

The smoke billowed over the field.
烟波涛般滚滚向前越过原野。