Standing in the proverbial middle of the political road, I'd like to offer my thoughts on this issue.
Personally, I don't smoke. I don't associcate myself with people who smoke, and I avoid it on every occassion. The only time I'm really confronted with it is when I go out to bars/etc. Now, I'm a middle 20something who attends bars on a regular basis so I get exposed to quite a bit of secondhand smoke. The detrimental health effects have been proven and aren't worth going into here. It's bad for you, plain and simple. Is drinking bad for me? Absolutely, but the difference is that I can't get secondhand alcohol poisoning. If the damage is going to be done it's going to be done by me and no one else. Of course, I could avoid it entirely by not going to the bar, and that's a semi reasonably argument for the smokers but really doesn't hold water in my opinion. I believe that I should be able to enjoy the bar, the same as the smokers, without their bad habits being "forced" upon my person in the form of secondhand smoke. Bars with great ventilation go a long way to help this, but we know that adding a few fans in each bar isn't exactly the solution that's saught in this instance.
I can appreciate the smoking ban on gov. buildings, places with children, public transportation, etc. Part of me wants to agree that if the private businesses want to ban smoking, it should be their decision. Another part of me knows that unless all the businesses do this at once, the one's who do will invariably lose business from the smokers (though personally, I don't care because I only go for the non-smoking women anyways). So while my initial response is to support the "ban it everywhere" argument, the reasonable, moderate side of me things the gov. may be going too far with a flat ban.