New analysis of prior research finds that many of the learning and memory problems caused by cannabis consumption can linger for weeks.
In adolescence the brain is especially vulnerable, said Staci Gruber, director of the Cognitive and Clinical Neuroimaging Core and the Marijuana Investigations for Neuroscientific Discovery at McLean Hospital. “Almost anything can change the trajectory of brain development,” added Gruber, who is also an associate professor of psychiatry at Harvard Medical School. “If you can protect your brain from everything, not just cannabis, it’s best for the brain.
Not everyone is convinced that cannabis causes bad outcomes, said Dr. Igor Grant, distinguished professor in the department of psychiatry and director of the Center for Medicinal Cannabis Research at the University of California, San Diego. “It’s the whole chicken-and-egg question,” Grant said. “When you look at twin studies, you don’t find any difference between the twin who started using and the one who didn’t. So I’m not persuaded that longterm memory loss.”
Regardless, there are reasons to be concerned about its short-term impact on teens and young adults, said Dr. Nora Volkow, director of the National Institute on Drug Abuse. “If you look at the effects of the drug on teenagers, you need to consider, for example, what happens when a teen uses cannabis and then fails a test,” Volkow said. “If the teen gets exposed to many failures they may lose self-esteem. And so the consequences can go beyond the use of the drug in the moment.”“If you see a change in the behavior of your kid, you should look into it,” she said. “You should not assume this is just a teen being a teen.
France Dernières Nouvelles, France Actualités
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