Global health. The current scenario and future perspectives

218 Source: Own elaboration based on National Institutes of Health. (2021). Monitoring the Future. Trends & Statistics. For studies in the general population aged 12 and older, Figure 6 shows the trend in the past-year marijuana use by age groups (Substance Abuse & Mental Health Data Archive, n.d.). Between 2002 and 2007, a stabilization is observed in the age groups of 18 to 25 and 26 and older, followed by a systematic increase. However, a stabilization and even a decrease are observed in the group aged 12 to 17 towards the last years of the series. Moreover, until the combined indicator for 2016-2017, the prevalence in this group was higher than the group of 26 years and older. Nonetheless, since then, the situation has reversed and in recent studies it is even lower than that age group. Figure 6. Past-year prevalence of marijuana use in the United States by age group. 0 5 10 15 20 25 30 35 40 45 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Past-year prevalence marijuana use, by grade and total school population, United States, 1991-2021 Total 8th 10th 12th