Whether or not smokers accept this opinion, one would certainly be hard-pressed to find a smoker who doesn't know and accept the health risks of smoking. Our society is based on the concept that smokers are free and responsible adults, allowed to make their own decisions about pleasure versus risk. They may make what somebody else considers the wrong decision, but freedom is ultimately the right to make the wrong decision. Similarly, our freedom and prosperity are inextricably based on our right of private property, which is not something that should be diminished on the basis of dubious scientific evidence. Bar owners who risk their money, energy, and future on their private business have a right to run that business as they see fit.
Nobody forces customers into a smoky bar.
If customers avoid smoky bars voluntarily, however, that is the most certain way to assure the presence of smoke-free bars. Government is being less than honest in its crusade against smoking. Ultimately, this is a great deal more dangerous than the putative risks of second-hand smoke.