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In our daily life, some adults (成年人) like smoking, they think that smoking can help them relax. A few students also like smoking, they think that smoking is very cool. In fact, smoking is really unhealthy. Do you know that there are more than 4 000 chemicals in cigarettes? These chemicals are bad for our bodies. They can cause cancer and other diseases.

The smoke from cigarettes harms not only smokers but also other people. It's called "second-hand smoke" and it can be more dangerous and has higher risks. Smokers shouldn't use smoking to help them relax. They must give up smoking as soon as possible.