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MONTREAL — Michael Rolli made his first purchase of legal marijuana in Canada earlier this year, walking into a sleek, glass-walled storefront in downtown Montreal that was run, not by a private, profit-seeking company, but by the government. Having bought a few grams of weed, he walked out onto the sidewalk and with a flick of his thumb sparked up a pre-rolled joint. Office workers on their lunch breaks streamed past without a second glance. Unlike anywhere in the United States, smoking pot in public is legal here, in certain areas. “This is pretty perfect,” Rolli, 25, said, inspecting the cone shape of the joint. “My friend can roll good joints, but this is better — it’s like the Olympic torch. In legalizing marijuana, Canada did everything differently. Here’s what we can learn

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