Heavy Marijuana Use Shrinks Your Brain But Compensates By Making More Connections

The first comprehensive investigation into the effects of long-term marijuana use has revealed that while the drug appears to shrink a certain part of the brain in heavy users, their brains will actively compensate for it by increasing connectivity - especially if they started using it young.

http://www.sciencealert.com/heavy-marijuana-use-shrinks-your-brain-but-increases-connectivity-when-you-re-young