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Marijuana enthusiasts light up at 4:20 p.m. MDT to mark the 4/20 holiday on Thursday, April 20, 2017, in Denver's Civic Center Park. The annual celebration of cannabis culture attracted users from across the intermountain West to Denver. (AP Photo/David Zalubowski)

Marijuana enthusiasts light up at 4:20 p.m. MDT to mark the 4/20 holiday on Thursday, April 20, 2017, in Denver's Civic Center Park. The annual celebration of cannabis culture attracted users from across the intermountain West to Denver. (AP Photo/David Zalubowski)

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