Why do some people become addicted to smoking or alcohol?

为什么人们变得开始酗酒和嗜烟?我理解这句话意思，我要的是150字作文Why do some people become addicted to smoking or alcoholIt has been estimated that smokers have made up half of the population in China. And the smokers are becoming younger and younger,even ineluding some middle school students.Nowadays more and more people have realized smoking and alcohol can do harm to people'shealth. However, some people still enjoy smoking and alcohol. Why? Because some of them think it is a kind of fashion, some think it is of GREat fun and others, think that smoking and alcohol can refresh themselves.In fact,smoking and alcohol is a bad habit. It can cause a lot of diseases. Meanwhile smoking and alcohol is a waste of money. Besides, careless smokers may cause dangerous fires.Smoking and alcohol is harmful and it is not only bad for smokers themselves, but also bad for non-smokers.Therefore, I hope all the smokers can give up smoking and alcohol for themselves and also for the people around them.