Most people start smoking as teens. Those who have friends and/or parents who smoke are more likely to start smoking than those who don’t. Some teens say that they “just wanted to try it,” or they thought it was “cool” to smoke.Anyone who starts using tobacco can become addicted to nicotine. Studies show that smoking is most likely to become a habit during the teen years. The younger a person is when they begin to smoke, the more likely they are to become addicted to nicotine.