The origins of 4/20, marijuana’s high holiday

FILE – In this Aug. 15, 2014 file photo, set to the symbolic 4:20 time, weed patterns adorn clocks up for sale on the first of three days of Hempfest, Seattle’s annual gathering to advocate the decriminalization of marijuana at Myrtle Edwards Park on the waterfront in Seattle. (Jordan Stead/ via AP, File)

It’s 4/20, the high holiday for marijuana culture. But why?

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