The brain of a teenager has a lot of developing to do. It must transform from the brain of a child into the brain of an adult. And some researchers worry how marijuana might affect that crucial process.
“Actually in childhood our brain is larger,” says Krista Lisdahl, director of the brain imaging and neuropsychology lab at University of Wisconsin, Milwaukee. “Then during the teenage years our brain is getting rid of those connections that weren’t really used, and it prunes back. It actually makes the brain faster and more efficient.”