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PHOTOS: Past 4/20 gatherings in Boulder

10:31 AM, Apr 20, 2012   |    comments
  • BOULDER, CO - APRIL 20: A haze of marijuana settles on the crowd at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: The haze of marijuana smoke looms over a crowd of thousands at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: Young men smoke a marijuana cigarette during a 'smoke out' with thousands of others April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A young woman sits on the shoulders of a friend as a haze of marijuana settles on the crowd at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A woman applauds as the haze of marijuana smoke looms over a crowd of thousands at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A haze of marijuana settles on the crowd at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: The library building looms over a haze of marijuana smoke near a crowd of thousands at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: Marijuana saleswoman Marissa Dodd (L) bags up a sale for a customer at Dr. Reefer's marijuana dispensary April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A young woman stands in the crowd during a 'smoke out' with thousands of others April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: The haze of marijuana smoke looms over a crowd of thousands at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: The haze of marijuana smoke looms over a crowd of thousands at 4:20 pm April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A young woman smokes a marijuana cigarette during a 'smoke out' with thousands of others April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: A student smokes a marijuana cigarette during a 'smoke out' with thousands of others April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
  • BOULDER, CO - APRIL 20: Young men smoke a marijuana cigarette during a 'smoke out' with thousands of others April 20, 2010 at the University of Colorado in Boulder, Colorado. April 20th has become a de facto holiday for marijuana advocates, with large gatherings and 'smoke outs' in many parts of the United States. (Photo by Chris Hondros/Getty Images)
    
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Last year, some 10,000 people gathered at the University of Colorado-Boulder to simultaneously smoke marijuana. This year, the university is shutting down a campus quad that hosts the annual 4/20 gathering.

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