"Colorado teens stubbornly refuse to smoke more weed." That's the smart-alecky headline over a chart of youth cannabis use rates that appeared in the Washington Post June 21. The story cites Colorado Health Department findings that rates of use among the state's teenagers are essentially unchanged in the years since the herb was legalized there in 2012. In last year's figures, 21% of Colorado youths had used cannabis in the past 30 days. That is slightly lower than the national average, and down from 25% in 2009. The findings are based on a random survey of 17,000 middle and high school students. "The survey shows marijuana use has not increased since legalization, with four of five high school students continuing to say they don’t use marijuana, even occasionally," the health department stated.