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A reveler lights a joint to take part in a mass lighting ceremony to cap multiple days of festivities to mark the unofficial 4/20 marijuana holiday Monday, April 20, 2015, in Denver. The mass lighting was done at 4:20 p.m. to cap off the activities in Colorado. (AP Photo/David Zalubowski) ** FILE **

A reveler lights a joint to take part in a mass lighting ceremony to cap multiple days of festivities to mark the unofficial 4/20 marijuana holiday Monday, April 20, 2015, in Denver. The mass lighting was done at 4:20 p.m. to cap off the activities in Colorado. (AP Photo/David Zalubowski) ** FILE **

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