It's all fun and games until your brain changes. Using marijuana just a few times per week can physically alter the structure of your brain, a study in The Journal of Neuroscience reported on Tuesday. Scientists examined the difference in brain features between light smokers and non-smokers, and found volume, shape, and density differences in two areas. "This is a part of the brain you do not want to mess around with," study leader Hans Breiter said.
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