Most people don't smoke. I dare say most of those who don't smoke don't want to breathe someone else's toxic fumes. Majority rules in most places.
When I enter a store and there is some inconsiderate ape sucking on a cancer stick and I have to pass through his cloud of poison I resent it. And, if there is a sign that plainly says NO Smoking within so many feet of the entrance I will mention it.If said ape doesn't like that he can discuss it with the cop I call.