Prevalence and Trends in Marijuana Use Rates in Colorado Before and After Passage of Amendment 64

Marijuana Use in Colorado by Age According to SAMHSA
Marijuana Use in the Past Year Marijuana Use in the Past Month
Survey Year 2008-2009 2014-2015 2015-2016 2008-2009 2014-2015 2015-2016
Ages
All Ages 12 and Older 15.12% 23.09% 23.12% 9.77% 16.57% 15.92%
12-17 18.55% 18.35% 16.21% 10.17% 11.13% 9.08%
18-25 38.59% 45.24% 47.54% 24.18% 31.75% 32.20%
26 and Older 10.79% 19.91% 19.85% 7.31% 14.65% 14.00%