The event is the brainchild of Jim McAlpine who came up with the idea more than two years ago as a way to "de-stigmatize the millions who use cannabis in a healthy and responsible lifestyle."

Former college football player Dexter Holman is going to smoke a joint Saturday morning, eat a bowl of oatmeal, then run 4.2 miles from Santa Monica to Venice and back for what he says is a worthy cause.

He'll be among the more than 1,000 participants running, walking, skateboarding and biking in the 420 Games. 

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Jason Kandel ~ NBCLosAngeles.com ~