1.We feel we have to discourage them from smoking.
discourage from勸阻
I think we should discourage people from using their cars.
我認為我們應該減少其使用的汽車的人 。
2.One company in Japan is trying to get its staff to quit smoking...
quit 放棄;停止;戒掉
I've quit smoking.
我戒了煙 。