Rates of marijuana use among Colorado’s teenagers are essentially unchanged in the years since the state’s voters legalized marijuana in 2012, new survey data from the Colorado Department of Public Health and Environment shows.
In 2015, 21 percent of Colorado youths had used marijuana in the past 30 days. That rate is slightly lower than the national average and down slightly from the 25 percent who used marijuana in 2009, before legalization. The survey was based on a random sample of 17,000 middle and high school students in Colorado.
That is from Christopher Ingraham at Wonkblog. Those are surveys, yes, but even the continuing feeling that one needs to lie and say no should count for something.