Long-term, heavy cannabis use seems to shrink parts of the brain relating to memory, the regulation of emotion and aggression, a study finds. Murat Yucel at the University of Melbourne, Australia, and colleagues used high-resolution magnetic resonance imaging to compare the brains of 15 men who had smoked at least five joints daily for more than 10 years with those of non-drug users. The cannabis users drank alcohol in moderation and had taken no other drug more than 10 times. (source: newscientist.com)
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