Smoking is a serious problem in China. For the old generation, they get used to smoking in their young time, while for the young generation, most of whom need to smoke for business. Even in the public occasion, non-smokers are threatened by second-hand smoke. It is in need of controlling smoking to provide the public a clean environment. So it has been advised to ban smoking in the public. In western countries, people only smoke in the special zones. They do this to respect others. What's more, if the cigarette's tax is increased, then the number of smokers will decrease. For health, smoking situation must be controlled.