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A prevention program for young teens reduced substance use among friends of participants, as well as the participants themselves.

That’s the finding of a new CDC study, evaluating impact of the Strengthening Families Program for youth ages 10 to 14. Previous studies have demonstrated effectiveness at reducing participating individuals’ substance use and improves parenting approaches for participating moms and dads, but these new insights suggest the broader, “viral” social impact of individual youth taking part in prevention programs.

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