Great video from the Harvard T.H. Chan School of Public Health on the latest scientific findings and legalization of marijuana. With California, Massachusetts, Maine, and Nevada becoming the latest states to legalize recreational marijuana, it brings to 28 the number of states that have okayed the drug for medicinal use, recreational use, or both. Part of The Dr. Lawrence H. and Roberta Cohn Forums, this event was presented jointly with The Huffington Post on Friday, March 24, 2017.