Three-year follow-up on the effects of a smoking prevention program for elementary school children with a quasi-experimental design in Japan.

Objective: We performed the follow-up tests for three years for junior high school students by the quasi-experimental design to investigate the medium-term effect of smoking prevention education in the elementary school.

Methods: The intervention group consisted of 106 school students of three elementary schools and received a smoking prevention program in the elementary school. Moreover, the follow-up tests were conducted at each grade of junior high school, and the booster program was mailed.