There is a strong belief among the general population that sport has positive effects. However, only some preventive effects of sport meet these high expectations. Numerous studies have specifically shown that sport does not protect people from the consumption of legal and illegal drugs such as alcohol, tobacco and cannabis. For this reason, the umbrella organisation of Swiss sports associations (Swiss Olympic), the Federal Office of Sport (FOSPO) and the Federal Office of Public Health (FOPH) teamed up as early as 2003 and launched the “cool and clean” prevention programme.