Figure 6.

Evolution of the 'heroin epidemic'. Evolution of the 'heroin epidemic' in 3 phases using approximated incidence trends of regular heroin use per 1,000 population during 2 decades in all 26 cantons of Switzerland. The darker the area the higher the affected birth cohorts in the respective canton, using 5-year age group categories from annual statistic tables between 1999 and 2006.