Dr. Margaret Haney talks to Allan Wolper on WBGO

 Research has shown that repeated marijuana use can affect the brain of a teenager. She says that California's laws on marijuana defacto legalize its use. Medical marijuana is permitted in 20 states and the district of Columbia. Colorado has legalized the drug for recreational purposes. Dr. Margaret Haney, Professor of Neurobiology (in Psychiatry), discusses what we know about marijuana’s effects, based on research in the field.
http://www.wbgo.org/internal/mediaplayer/?podcastID=5950&type=wolper