First of all, as most of us are runners and therefore mostly non-smokers, I assume most of us are pretty happy with smoking bans in bars and restaurants. I know I am. No more coming home stinking like an ashtray.
However, when you really think about it, is it fair to ban a legal activity like smoking in a private establishment? If we're talking public spaces, yes, I think smoking should be banned because that space is for use by the general public. However, in a private business where the owner sets the rules, shouldn't he or she be able to decide what goes?