1.We feel we have to discourage them from smoking.
discourage from劝阻
I think we should discourage people from using their cars.
我认为我们应该减少其使用的汽车的人 。
2.One company in Japan is trying to get its staff to quit smoking...
quit 放弃;停止;戒掉
I've quit smoking.
我戒了烟 。