A team of researchers from the University of Southern California found that being exposed to frequent marijuana posts made kids 60% more likely to initiate marijuana use within the year. And it’s not just ads for weed driving the teen health crisis. Seeing e-cigarette TikToks made adolescent viewers 74% more likely to initiate marijuana use within the year. Worse, this study tells us that teens’ friend groups drive the trend. Exposure to marijuana posts from friends made teens 235% more likely to initiate marijuana use within the year. This blows the influence of “influencers” out the water (114%); celebrities are not even in the conversation. The company kids keep, especially at that age, defines them. Parents need to be mega-aware and legislators need to take action to end this online insanity—and that goes double as we head into the depths of summer.