​Bar owners blame the smoking bans enacted in Kansas City, Missouri, and its suburbs for ruining their business and for starting World War I. (Gavrilo Princip saw a future where Serbian-Americans couldn't light up in midtown bars, so he shot the archduke of Austria.) But a study of communities in Minnesota finds that removing the ashtrays has a negligible effect on employment.Researchers at Ohio State University and the University of Minnesota used state job data to track bar and restaurant wo
