Teens who see social media posts showing cannabis or e-cigarettes, including from friends and influencers, are more likely to later start using those substances or to report using them in the past month, according to research from the Keck School of Medicine of USC. Viewing such posts was linked to cannabis use, as well as dual use of cannabis and e-cigarettes (vapes). Dual use refers to youth who have used both cannabis and e-cigarettes at some point. The results were just published in JAMA Network Open.

The findings come amid a decline in youth e-cigarette use, reported in 2024 by the U.S. Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention. However, teen vaping, cannabis use and the dual use of e-cigarettes and cannabis remain a problem.

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