The purpose of the present study was to apply the stages of change model to
smoking acquisition in Japanese adolescents. The participants were 556 sen
ior and 1002 junior high school students who responded anonymously to the q
uestionnaire. The findings of this study confirm that the stage model is in
deed applicable to smoking acquisition in Japanese adolescents. It was clea
rly seen that the process involves four stages: pre-contemplation, contempl
ation, preparation, and action. Furthermore, the results showed that measur
es of self-efficacy decreased, while temptation increased from precontempla
tion to action stages. The pros of smoking behavior increased toward action
stage, while the cons decreased.