10% of U.S. High School Seniors Use Vicodin

Overall, nearly half of high school students will have tried an illegal drug before graduation, Katz said. "Progress has been made, but there is clearly work left to do."

Prevention and education campaigns can do a better job if they target the specific drugs that are popular at a given time, Katz said. "By doing this, and keeping the list of culprits perennially current, we might more effectively avoid the movement from one drug to another," he said.

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For more on drug abuse, visit the U.S. National Institute on Drug Abuse.