请勿吸烟的英文：
No smoking.

参考例句：

No smoking
不准吸烟;请勿吸烟

"Petroleum, highly flammable, no smoking, switch off engine"
"汽油,极易燃,请勿吸烟,请关掉引擎"

"Prestige, no smoking"
高雅场所,请勿吸烟

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。