Despite widespread interest in adolescent smoking behavior, little research has been directed to the social dynamics of adolescent smoking. In this paper, smoking intentions and peer group influences among a sample of 1,689 Grade 8 students from southern Ontario were analyzed to ascertain possible gender-specific correlates in adolescent smoking intentions. The peer environment was found to be a crucial factor in adolescent smoking behavior. Particularly striking for adolescent girls was the firmness of their expressed intentions to continue to smoke quite early in their smoking lives.