Marijuana use among Colorado high schoolers has not increased since legalization, the state Health Department reported Monday in a new batch of youth survey results.

The 2015 Healthy Kids Colorado survey of about 17,000 middle and high school students across the state showed that 21.2 percent of high school students reported that they currently use pot. That’s just a hair below the national average, which was 21.7 percent.

Since voters approved recreational marijuana use for those 21 and older in 2012, Colorado has worked to keep youths off of pot. Campaigns have said the drug will keep them from achieving their full potential and reminded them their brains aren’t fully developed until they reach 25.

Nine of 10 Colorado high school youth said they don’t smoke cigarettes, the highest rejection of smoking by high school youth in the past decade.