Should cigarette smoking be banned?

By google, we can find that the population of smoker in the world is about 1.5 billion now.
As we all know about it, cigarette smoking is harmful to human's health. Various diseases comes from cigaretee smoking, and these deases lead the cigarette smoking be the biggest mortality rate than any other diseases. And on another way, how can cigarette attract such a big group of people, and even the number is still growing as a fast speed. Some suggest that the goverment should take some kinds of policy to avoid the big killer: cigaretee smoking.
Most of the smoker believe that although smoking is harmful to their health, but the benefit of smoking is much important than the harm it brings. By a survey of a group of smokers who come from China, They support some benefit of smoking. Firstly, smoking can refresh oneself when people were tired. Secondly, smoking can decrease the pressure of one's job or live. And so on. And they protest that cigatette is their freedom, nobody can make the cigarette smoking be banned. And I think so.
From this agument, I think we can get many informations about the cigarette smoking, such like the diseases caused by smoking.