(CNN) - A new survey finds marijuana continues to be the most popular illicit drug for many teens.

The National Institute on Drug Abuse released its annual Monitoring the Future survey Wednesday.

Researchers surveyed more than 45,000 eighth, 10th and 12th graders. More of them said they'd used marijuana in the past year than any other illegal drug.

Also, for the first time, the survey asked teens about bath salts, which have been blamed recently for dozens of episodes of bizarre, violent behavior.

But this latest survey found use of the amphetamine-like stimulant is low among those surveyed.

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