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Cannabis is the most widely used illicit drug on the planet. To many, its an evil weed, but to some,
its a sacred herb, even a lifesaver. For decades the global supply was controlled by criminals,
but now a quasi-legal industry worth billions of dollars is booming. Visit growers who are leading a horticultural revolution,
hear from users consuming for medicinal purposes, go inside the quot;Green Rushquot;
of medical marijuana in cities across the U.S. and the violent marijuana cartels in Mexico.