The next big thing in medical marijuana might be cancer therapy. But with little hard evidence, families whose kids have cancer are taking matters into their own hands.

Why veterans with PTSD often choose not to use medical marijuana: although it's legal in many states, it is not legal at the federal level. As a result, marijuana use may violate the terms of the disability agreement, which rely on for income and care.

Krishna investigates how Bernard Noble's two joints led to 13 years in prison.

Krishna travels to Colorado, meeting families who've relocated to seek medical pot and starry-eyed ganjapreneurs trying to strike gold in America's Marijuana Mecca.

Krishna meets growers in CA whose farms are threatened by corporate interests.

Krishna travels to Congo to meet the mbuti pygmies, female dealers and farmers in rebel territories who all smoke and sell weed as a way of eking out a living.

Can the booming business of marijuana become the first gender-equal industry? Krishna meets women working across the pot trade.

Krishna heads to DC and Amsterdam to see if partial pot legalization works.