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April 20, 2010 6:43 AM

Marijuana smoke-ins pay homage to pot's '420' nickname

Today is the Fourth of July of weed. In California, at places such as Golden Gate Park in San Francisco, Porter Meadow at UC Santa Cruz and Redwood Park in Arcata, thousands will light up in celebratory marijuana smoke-ins. April 20 has morphed into a social, political and cultural event, with 4/20 fests lighting up college towns and urban centers from Seattle to Boulder, Colo., to New York City.

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