When you are in public places， you will see many smokers， most of whom are young people and even middle school students. It is said that in China smokers cover about 45 percent.Why do so many people enjoy smoking？ Some think that it is a pleasure， some believe that it can refresh themselves. In fact， smoking is a bad habit. It does great harm to our health， not only to the smoker himself， but also to others. For smokers， it is a great waste of money， and it causes many kinds of diseases. Besides， many fires are caused by careless smokers.Today， more and more people are beginning to realize the harm of smoking and decide to give it up. If you are not a smoker， don't start.