Its not impossible for me, but I always warm up a little when I see ashtrays. (No, I don't smoke, unless its a pipe) but I like to be in places where people relax and enjoy themselves, and smoking bars do this better than non-smoking bars.
If I were a bar owner, I would allow smoking and provide a good ventilation system in part of the place so that non-smokers or those who wanted to stay but were bothered by the smoke would be as comfortable as they could be. I also have no problem with nonsmoking establishments, escept that I would not normally return to them. Finally, if I were a bar owner myself, and the city or state decided on a smoking ban, I would see about moving to a different state. The degree of government control seems to vary a lot from state to state. No problem, since we are mobile.