Is pot winning the legalization debate?

cnn.com - It's the story everyone is talking about. Is marijuana harmful or helpful? CNN's Dr. Sanjay Gupta cuts through the smoke on America's "green rush" and journeys around the world to uncover the highs and lows of "Weed" Friday night at 10 ET.(CNN) -- The question has dipped in and out of the national conversation for decades: What should the United States do about marijuana?Everyone has heard the arguments in the legalization debate about health and social problems, potential tax revenue, public safety concerns and alleviating an overburdened prison system -- but there isn't much new to say.