Adolescents who smoke most likely have friends who smoke. According to the surgeon general, this is the result of both socialization and friend selection. Adolescents learn about smoking by hanging around others who smoke. The decision to light up is reinforced by a desire to be accepted by their peer group, to fit in and establish a social identity. Likewise, teens who perceive that their friends disapprove of smoking are less likely to smoke. Teens who smoke also tend to make friends with other smokers, reinforcing their decision to smoke.