January 2016 Update:
YOUTH USAGE: 
• In the two year average (2013/2014) since Colorado legalized recreational marijuana, youth past month marijuana use increased 20 percent compared to the two year average prior to legalization (2011/2012). o Nationally youth past month marijuana use declined 4 percent during the same time.
• The latest 2013/2014 results show Colorado youth ranked #1 in the nation for past month marijuana use, up from #4 in 2011/2012.
COLLEGE USAGE:
•Colorado college age past month marijuana use for 2013/2014 was 62 percent higher than the national average
ADULT USAGE:
•The latest 2013/2014 results show Colorado adults ranked #1 in the nation for past month marijuana use, up from #7 in 2011/2012.
• Colorado adult past month marijuana use for 2013/2014 was 104 percent higher than the national average compared to 51 percent higher in 2011/2012.