This is such a common sense issue. I do not and should not have to breathe in your second hand smoke in a building. That is simply wrong and common sense dictates as such. So if you are at a bar, go OUTSIDE and smoke. Puff away. Then I don't have to breathe in that crap. If you are willing to go outside, then puff away. Fill up you lungs with carcinogens.... good for you!
Common sense would be good. No one is saying you should have to breathe second hand smoke. Buildings that allow smoking should be clearly marked and you should never be forced to go in one.