In a survey of 2,744 teens, the 12% who reported using tobacco, alcohol and marijuana at least once in the past year had a greater likelihood of substance misuse, according to a study in the journal Addictive Behaviors. Other subgroups considered to be at high risk were the 8% who reported alcohol, nonmedical prescription drug and excessive prescription drug use during the previous year, and the 4% who said they used all substances at least once in the past year. The study found that 76% of those surveyed were at very low risk of substance misuse.

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