How to say no smoking in Japanese?

No Smoking (きんえん kin en can be used as a slogan against smoking, and also used as a talk about quitting smoking)

ここは无码です. (koko wa kin en desu no smoking allowed here)

タバコはダメ! (たばこはだめ ta ba ko wa dame no smoking allowed)

たばこは prohibition (きんし)されている. (ta ba ko wa kinshi sa re te i ru no smoking)

たばこ prohibit (tabako kin shi no smoking)