Actually it's worse if you inhale the smoke instead of smoking.
Also what Goku said about the air pollution, in my opinion is irrelevant. The air will get polluted from smoking inside as well, so that is not a strong argument.
As a smoker myself I would personally not agree with that.
I mean, there are a lot of places where smoking is prohibited. The public space is meant to be PUBLIC, not "NON SMOKERS ONLY".
But this is just my opinion, and I also don't want to be considered an insult for non smokers.