How to reduce smoking among teenagers.

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Abstract
In this issue of the Journal, Holmen et al. 2 report their findings from a cross-sectional population study in a county in Norway. The study seems to be well designed and conducted with a high participation rate of >90%. In this group of student teenagers physical activity was inversely associated with smoking and a positive correlation was observed between exercise and lung function in never-smokers. This is in accordance with other studies i.e. in US high schools. Students who play at least one sport are 40% less likely to be regular smokers and 50% less likely to be heavy smokers. Regular and heavy smoking decreases substantially with an increase in the number of sports played 3.