If your teenager friend smokes, what can you do to help him give up smoking?

Today smoking is a widespread habit all over the world. Not only the old, the youth, but also middle school students have been engaged in smoking. Many of them think that smoking is a smart symbol.
If my teenager friend smokes, what can I do? Firstly, I will tell him that smoking is harmful to one's health. It contributes a lot of lung cancer, from which many people have died in the past years. Secondly, I will tell him that smoking is not only harmful to smokers themselves, but also a threat to public health, especially to women and children. In order to keep healthy, he should get rid of the bad habit of smoking. Finally, I will tell him some method to give up smoking such as do something meaningful to forget smoking.