Actually they wouldnt go out of business because all bars would be non-smoking except for private clubs. The non-smokers outnumber the smokers in the general public so if it goes to some kind of vote it could very well happen.
1` important point. When your cigarrette/cigar is burning it emits the unfiltered smoke. The smoke the smoker inhales is often at least filtered.
If the filtered smoke is bad for you, then the unfiltered is worse.
They do it in New York ans many other cities that are bigger or as big as Cincinnati, and most office buildings are allready smoke free so it's really not much of a reach.