Dr. Gupta 'doubling down' on pot

 	(FILE) Picture taken in Montevideo on May 8, 2013 of a young man smoking a marijuana joint during a demonstration demanding a new law on cannabis. Despite the bill to legalize the cultivation and production of marijuana has yet to be passed by the Senate, the Uruguayan government is already preparing its regulations which include a sale price of one gram per dollar. AFP PHOTO / Pablo PORCIUNCULA (Photo credit should read PABLO PORCIUNCULA/AFP/Getty Images)

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    Dr. Gupta 'doubling down' on pot

CNN's Dr. Sanjay Gupta talks about why he is pushing for the U.S. to adopt medicinal marijuana laws.