CNN's Sanjay Gupta Reacts to Robust 'Weed' Documentary Response

Calling out a lack of medical marijuana research, Sanjay Gupta has brought pot to the forefront.

NEW YORK - MAY 05: CNN's chief medical correspondent Dr. Sanjay Gupta attends Time's 100 Most Influential People in the World Gala at the Frederick P. Rose Hall at Jazz at Lincoln Center on May 5, 2009 in New York City.