The New York Times, This is Your Brain on Drugs, Nov. 2, 2014

Studies show that the effects of marijuana on young people may be greater than we thought.  The gray matter of the nucleus accumbens, the walnut-shaped pleasure center of the brain, was glowing like a flame, showing a notable increase in density. “It could mean that there’s some sort of drug learning taking place,” speculated Jodi Gilman, at her computer screen at the Massachusetts General HospitalHarvard Center for Addiction Medicine. Was the brain adapting to marijuana exposure, rewiring the reward system to demand the drug?

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