From the Colorado state capitol in Denver, head south on Broadway, one of the city's main arteries, and before long you find yourself in "Broadsterdam", a cluster of dispensaries with names like Ganja Gourmet and Evergreen Apothecary. They peddle dozens of strains of pot, as well as snacks, infusions and paraphernalia, to any state resident bearing a "red card": proof of a doctor's recommendation. Landlords in the area were struggling, says William Breathes (a pseudonym), whose reviews for a local paper make him, he says, America's first mainstream pot critic. But when Colorado began to regulate the sale of marijuana for medical use in 2010, they saw an opportunity.
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