In recently published data from the Cannabis Advertising and Social Media study (CASM), youth who engaged with cannabis brands and advertisements on social media were 5 times more likely to have used marijuana over the past year compared to those who did not. Moreover, youth who had a favorite brand of cannabis were 8 times more likely to report marijuana use than those who did not. These results send a clear signal to lawmakers that contrary to the assertions of the marijuana industry, legalization does indeed result in increased use among adolescents. We know that the human brain is an [...]