overview of studies https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3930618/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3930618/ Every measurement of brain funct

overview of studies https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3930618/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3930618/ Every measurement of brain function decreased significantly with marijuana use, long term abstention seemed to clear up some problems, though physical changes in brain did not go away in users who started as adolescents, there were long term permanent changes to brain function.