According to Orawan(2009), Cause of cigarette addiction in teenager in Thailand has three main ways. Almost all is because teenager is curiosity so they want to try new thing to show that they are adult. Smoking is interesting, exciting and challenging. Many teenager think smoking help them to socialize because smoking the way to present that they're brave and cool so they still try to smoke although they know that will cause effect to their health. Next, the surrounding around teenager is also important. Teenager who lives with smoking parents will have a tendency to try smoking more than teenager who lives with no smoking parent. Finally, Teenager who has problems with mental health like depression, strain and lack confident always smoke cigarette to relieve because they misunderstand that smoking cigarette can decrease strain.