Dr. Sanjay Gupta is perhaps the most famous doctor in America—Doctors Phil and Oz not included. He is a practicing neurosurgeon as well as CNN's chief medical correspondent, giving him ample face time with the American public. Last night, Gupta told Seth Meyers and the American public why he changed his opinion on legalized medicinal marijuana, which he had opposed. His opposition was based on research, he explained, but the research didn't give the full picture: Instead of looking for benefits, it focused on potential harm. Thus, the benefits of medicinal marijuana are understudied in America.

"I believe marijuana can be a medicine," Gupta told Meyers, citing research done outside the U.S. And if medicinal marijuana is the only treatment that works, Gupta argued, then perhaps it would be medically immoral to withhold that treatment from those with no other hope for relief.

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Medical marijuana is legal in 28 states—four states approved it on Election Day. Without FDA approval, it is truly a treatment by the people, for the people. The most famous (legitimate) doctor in America publicly changed his mind about it, setting the precedent for others. Only 22 states to go.

Sarah Rense Sarah Rense is the Associate Lifestyle Editor at Esquire, where she covers tech, food, drink, home, and more.

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