More than 63 million Americans now live in states where recreational marijuana use is legal — but that doesn’t mean more teens are smoking weed, according to new national data.

The 42nd annual Monitoring the Future study, commissioned by the National Institute on Drug Abuse, surveyed eighth-, 10th-, and 12th-grade students across the U.S. and found that self-reported use of drugs is down overall, and alcohol and tobacco use are at their lowest rates since the ’90s.

Marijuana use remained steady despite shifting attitudes about weed, particularly among young people.

“I don’t have an explanation,” Dr. Nora Volkow, director of the National Institute on Drug Abuse, told U.S. News. “This is somewhat surprising. We had predicted — based on the changes in legalization, culture in the U.S., as well as decreasing perceptions among teenagers that marijuana was harmful — that [accessibility and use] would go up. But it hasn’t gone up.” [Read more at VICE]