[Smoking, body image and reducing diet. A three-year follow-up of adolescents aged 15-18 years].

Several studies indicate that the differences in smoking habits which have hitherto prevailed between the sexes are decreasing, partly because of the increase in smoking among young Norwegian women. It has been suggested that concern about body image and weight gain is of particular relevance to women taking up smoking. In this article we present findings from a cohort study among 646 adolescents between the ages of 15 and 18 years. The results indicate that boys start smoking later than girls, and that concern about weight gain, body image and dieting plays a more important role in girls' than in boys' smoking habits at the age of 15. These factors are unrelated to boys' smoking habits at the age of 18, whereas they contribute significantly in predicting girls' smoking habits three years later. Furthermore, the results show that among girls, those who smoke are more concerned about gaining weight. Our findings emphasize the importance of implementing smoking prevention programmes at different age levels, using different motivating factors for boys and girls.