Prevalence of Cannabis Use
"As shown in Figure 1, the proportion of young adults who reported ever having used cannabis increased from 22 per cent in 1998 to 30 per cent in 2002 and 34 percent in 2006. This was followed by a decline to 26 per cent in 2010. The increase in lifetime prevalence in the first half of the 2000s can to some extent be explained by the increase that was found among those aged 15–20 in the latter half of the 1990s, who were in the age group 21–30 in 2006.
"As regards use during the last six months (Figure 2), there was an increase from seven per cent in 1998 to ten per cent in 2002 and 2006, while the corresponding proportion in 2010 had stabilised at nine per cent. There were far more men than women among young adults who reported ever having used cannabis. This applies to both those who reported ever having used cannabis and those who reported having used it during the last six months."
Norwegian Institute for Alcohol and Drug Research, "The Drug Situation in Norway 2012: annual report to the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA)," (Oslo, Norway: December 2012), p. 18.