This Is Your Brain on Drugs

According to a recent study by University of Pensylvannia scientists, there were small or limited associations between [adolescent] cannabis use and structural brain measures. But even calling the effect small is aggrandizing harms. Their data didn’t support the notion that teens using cannabis causes any changes in the developing brain. The report goes on to say that Detailed studies of vulnerability to structural brain alterations and … long-term risk are clearly indicated, which is directly refuted by their own data. A few days earlier, another study from the University of Colorado Boulder found that a few brain regions are larger in adult cannabis user, though this wasn’t associated with different cognitive abilities.

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Adrian Devitt-Lee, Project CBD's chief science writer, is pursuing his PhD in Mathematics at the University College of London.