The question remaining is: Are small brains are the cause or the effect of pot use?
STUDY: Regular pot smokers have shrunken brains...
Among those who use marijuana at least four times weekly, the brain motivation and reward network looks different and works differently than it does in those who don't use pot, a new study finds.
Even now, however, the authors of the study acknowledge that they cannot discern whether a pot smoker's smaller orbital frontal cortex is the cause or the result of chronic marijuana use. A 2012 study found that subjects with a smaller orbital frontal cortex at age 12 were more likely to start using marijuana by age 16, suggesting that deficits in this crucial region may predispose one to substance-abuse behaviors.
Edited by Rogerdodger, 11 November 2014 - 09:47 AM.