In order to prevent non-smokers from being affected, measures must be taken to reduce the chances of smoking. A lot of work can be done concerning this. For example, in some public places, such as in the theatres and cinemas, smoking should be forbidden. Even on the train or plane people should not be allowed to smoke. Doctors, teachers and government leaders should take the lead not to smoke. Above all, the harmfulness and dangers caused by smoking should be made known to all through newspapers, broadcast, or TV programs. Also the growing of tobacco and the production of cigarettes should not be encouraged. If these measures can be taken, we can effectively reduce the chances of smoking.