Two economists from the St. Louis Fed, Michael Owyang and Katarina Vermann, have published a paper on the effectiveness of smoking bans. They conclude:
Nonetheless, the results of this paper imply that increasing cigarette taxes may be more effective in changing smoking behavior than implementing a ban. In the majority of the estimates, the magnitude of an increase in cigarette prices is larger and of greater statistical significance than any of the magnitudes for an individual ban or the aggregate effect of all three types of bans. Hence, increasing taxes appears to be more effective in reducing the number of smokers. This finding is especially true in analyses of current smokers and their attempts to quit smoking: In all models of smoking cessation attempts, the ban variables are neither statistically nor economically significant, but the price variables are.