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To researchers’ relief, a very small portion of students — 1 percent or less — reported using “bath salts,” i.e., cheap powders that are sold online or in “head shops” that can act as powerful stimulants if ingested.

Poison-control centers and hospitals have had to deal with hundreds of emergencies relating to these drugs, which are being banned in places due to their toxicity and side effects.

There’s been a lot of media coverage about the problems with bath salts, and “maybe a lot of kids have gotten the message,” said Lloyd Johnston, the MTF survey’s longtime principal investigator.