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Even a small marijuana can change the teen brain, study finds



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By Shamard Charles, MD

Low level of marijuana use ̵

1; as few as once or twice – can change the teen brain according to a new study. 19659007] The study, which looked at the brain of 46 14-year-old girls and boys from Ireland, England, France and Germany, showed that teens who reported using marijuana leisure only once or twice showed increased volume of MR images in Many brains regions are involved in emotional-related treatment, learning and the formation of memories. The results of the study were published Monday in the Journal of Neuroscience.

Various figures show the differences in gray matter after cannabis use in adolescents. Revision of the Journal of Neuroscience

"Most would probably assume that one or two uses (joints) would have no influence, so we were curious to study this – and especially to investigate whether initial uses actually can produce brain changes that affect future behavior as subsequent use, "Hugh Garavan, lead author of the study and a professor of psychiatry at the University of Vermont School of Medicine, said in a mail to NBC News.

The study did not say what the increased brain material meant, but the researchers noted that the gray matter expansion contradicts normal youth development.


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