Young adults who smoke marijuana at least once a week showed changes in the size and shape of two key brain regions, according to a new study of 20 pot smokers and 20 non-pot smokers between 18 and 25.
This is the first time recreational marijuana use has been connected to significant brain changes.
The findings, a collaboration between Northwestern University and Massachusetts General Hospital/Harvard Medical School, were published in The Journal of Neuroscience.
Ross Reynolds talks with academic and activist Roger Roffman about his involvement with marijuana and public policy for 45 years. His latest book is "Marijuana Nation: One Man’s Chronicle of America Getting High: From Vietnam to Legalization."