Smoking in restaurant

I think that smoking should be banned in restaurant. First, if air circulation system does not work very well, smoking can cause bad breath to other people who have stayed restaurant. Second, the other people who don't smoke in restuatant can hate the odor of smoke. Finally, smoke of cigarette is so harmful that all people in restaurant can be given the bad condition for health. For that reason, the people who want to smoke may leave the place when they feel smoking desire. Then they must seek the place where they enjoy smoking at.