Study Links Casual Marijuana Use to Changes in Brain - US News: Recreational pot use by a small group of young adults caused significant changes to the shape and density of both the nucleus accumbens, a region of the brain involved in reward and addiction, and the amygdala, which helps process emotion and form long-term memories, the study authors reported.
These changes show that pot users' brains adapt to even low-level marijuana exposure, potentially making a person more vulnerable to drug addiction or changing their thought processes and emotions in unknown ways, the researchers said.
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