Giving up smoking had a magical effect on his stamina.

戒神奇地增强了他的体力。

I want to quit smoking.

我想戒。

The old man forswore smoking.

那老人下决心戒。

According to research, only one smoker in a hundred is able to kick the habit without some kind of help.

研究表明,百名吸只有名能够不借助任何帮助成功戒。

You ought to stop smoking, you know. For one thing, you’re damaging your health, and for another, you can’t afford it!

你知道吗？你应该戒。，你在损害自己的健康，二，你也抽不起！