Smoking is harmful to health. The number of smokers in the world is increasing. On average, there are 4 smokers in less than 10 people. Teenagers are smoking more and more, but they start smoking at 13. Some families influence smoking. Smoking is three times more likely to suffer from lung cancer than non-smokers. Some people are proud of smoking. Is it harmful to health or economic cost? We should stay away from smoking to keep us healthy