A big thing marijuana opponents warned you about is definitely not happening

Concerns about adolescent pot use have been one of the chief drivers of opposition to legalization campaigns in Washington, Colorado and elsewhere
The Washington Post (US)
Tuesday, March 21, 2017

us cannabis use wa coData coming out of Washington and Colorado suggest that those states' legalization experiments, which began in earnest in 2014, are not causing any spike in use among teenagers. Teen marijuana use in Colorado decreased during 2014 and 2015, the most recent time period included in federal surveys. A separate survey run by the state showed rates of use among teenagers flat from 2013 to 2015, and down since 2011. A state-run survey of 37,000 middle and high school students in Washington state finds that marijuana legalization there has had no effect on youngsters' propensity to use the drug. The Washington State Healthy Youth Survey found that the 2016 rate of marijuana use was basically unchanged since 2012.