Casual Marijuana Use Linked to Brain Abnormalities
The April 15, 2014 online edition of The Journal of Neuroscience published a study by Northwestern University which shows that recreational marijuana use (at least one time per week) by young adults (ages 18-25) results in altered brain changes. This MRI-scan study showed the degree of brain abnormalities in these regions and its direct relationship to the number of joints a person smoked per week. The more joints a person smoked, the more abnormal the shape, volume and density of the brain regions.
Read more studies on the negative effects of marijuana use on the brain at the bottom of this link.