Ten years ago, when Dr. Sanjay Gupta began investigating medical marijuana, very few people had ever heard of cannabidiol, or CBD. Six years later, two-thirds of Americans were familiar with CBD and 1 in 7 had tried it. In this episode, Dr. Gupta’s fifth documentary on medical marijuana explores how the science has grown by leaps and bounds and could benefit everything from autism to anxiety.

This special report originally aired on CNN on September 29, 2019.

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