Denver Steps Up 4/20 Security

    DENVER, CO - APRIL 20: Thousands of supporters of legalized marijuana light up at exactly 4:20 p.m in Civic Center Park April 20, 2012 in Denver, Colorado. Colorado goes to the polls November 6 to vote on a controversial ballot initiative that would permit possession of up to an ounce of marijuana for those 21 and older. (Photo by Marc Piscotty/Getty Images)

    4/20 celebration in Denver in 2012. (Marc Piscotty/Getty)

    Denver is ramping up security for Saturday's 4/20 celebration. But police are less concerned about the thick cloud of marijuana smoke that will floating above the mile high city Saturday afternoon and more focused on protecting the massive crowd of happy pot smokers in the wake of this week's deadly Boston Marathon attacks. 4/20 organizers are expecting up to 80,000 people to attend this year's event, as it is the first celebration since Colorado voted to legalize recreational marijuana use.

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