This is a link to the 4th annual report from the Rocky Mountain High Intensity Drug Trafficking Area publication which reports on the effects of legalization in Colorado.

Marijuana related traffic deaths increased 48 percent in the three year average (2013‐2015) since Colorado legalized recreational marijuana compared to the three‐year average (2010‐2012) prior to legalization.

Colorado youths who use marijuana was 70% higher than the national average

College-age marijuana use was 62% higher than the national average

Adult marijuana use increased 63% since legalization

Colorado youth, college-age young adults, and Colorado adults all ranked number one in the nation for past month marijuana use

Emergency department marijuana visits increased 49% after legalization

Hospitalizations related to marijuana nearly doubled from 6,305 in 2011 to 11,439 in 2014

The article reviews the history of marijuana in Colorado including the various eras
1 ) Early medical marijuanaera(2000–2008),
2)  Medical marijuana commercialization era(2009–current)
3)  Recreational marijuana era (2013–current)


Source: Microsoft Word – 2016 FINAL Legalization of Marijuana in Colorado The Impact – 2016 FINAL Legalization of Marijuana in Colorado The Impact.pdf