The legal status of cannabis for medicinal and recreational use rapidly evolved between 2007 and 2014, with the number of states with medical cannabis laws doubling from 12 to 24. As of September 2017, 29 states and the District of Columbia had medical cannabis laws, and 8 states and the District of Columbia had recreational cannabis laws.
The study found that nondaily cannabis use decreased among those aged 12 to 2J and 35 to 49 before 2007, increased among all adults after 2007, particularly among adults 26 to 34 — the latter by 4.5 percent. Daily cannabis use decreased among those 12 to 17 years of age before 2007 and increased among adults in general after 2007. Daily cannabis use was highest among 18 to 34-year-olds but overall, the rate of daily cannabis use increase did not differ significantly and ranged between one and two percentage points among adults 18 to
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