Previous studies of the influence of friends on adolescent smoking hav
e adopted the approach of asking adolescents about their friends. Howe
ver, studies in which the friends were also approached have shown that
adolescents' reports of friends behavior were not accurate (more clos
ely resembled their own behavior). In order to gauge the level of acti
ve social influence among adolescents we asked 14-15 year old students
what they did to influence others not to smoke or to smoke. Across tw
o surveys, a quarter of the Form 4 students were promoting antismoking
messages or activities and 3% were promoting smoking by encouraging o
r forcing friends, siblings and acquaintances to smoke. Relatively mor
e positive beliefs about smoking identified those students who activel
y promoted smoking whereas some positive beliefs about the adverse eff
ects of cigarette advertising tended to identify those who were active
ly antismoking. Use of this approach to examine the issue of social in
fluence provided information about the antismoking activities which st
udents conducted, and could be used to further examine which messages
students do not believe or do not use. For example, students believed
that smoking reduces fitness but did not promote this message to other
s, and the reasons for such disparity need to be investigated and shou
ld be addressed in the content of prevention programs.