Nicotine is one of the most addictive substances in the world. It is a stimulant, especially the central nervous system. Most people get nicotine from smoking. Smoking is most common during adolescence. The first reason, it is great stress reliever. Many people start to think smoke or continuous smoking that it relieves stress. It is only serves as a stress on a psychological. The second reason, many people have curiosity. Try to challenge teenagers, exciting, and fun, although that is not healthy for them. The last reason, it looks cool. Some people think that smoking make to look mature personality, and is accepted into a group of friends or society at the same age but in the fact those around disgust.