People gather to smoke marijuana during the “420 Toronto” rally in Toronto on Wednesday, April 20, 2016. Cannabis possession is illegal in most countries under a 1925 treaty called the International Opium Convention. But just like the U.S., some nations either flout the treaty or don't enforce it. Legalization supporters consider pot possession either legal or tolerated in Argentina, Bangladesh, Cambodia, Canada, Chile, Colombia, the Czech Republic, India, Jamaica, Jordan, Mexico, Portugal, Spain, Uruguay, Germany and the Netherlands. (Photo by Mark Blinch/The Canadian Press via AP Photo)
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