The tiny Mexican village of San Cristóbal is not somewhere you would immediately associate with North America’s cannabis revolution. Smoking weed is still illegal there and there are no headshops in town, just a sleepy plaza ringed by narrow, cobblestone streets.

But the most recognizable of the town’s 3,000 residents—Vicente Fox, the former president of Mexico—has recently become one of the continent’s highest-profile cannabis legalization advocates.

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