The study's purpose was to determine which factors were the strongest predictors of tobacco smoking behaviors among U.S. adolescents. The population included a nationally representative sample of 6,504 adolescents residing in the U.S. Data were collected in respondents 'homes using trained interviewers. Weighted population estimates showed that over half (55.6%) of adolescents had "ever tried smoking," nearly half of whom (48.2%) reported "regular smoking." Those whose closest friends smoked were twice as likely to "ever smoke " (OR = 2.24, p