How 420 became a symbol of marijuana



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Marijuana smokers will gather across the United States this Tuesday to mark a milestone on their calendar: 4/20 (April 20). And they will surely do it at 4:20 in the afternoon.

Although the 4/20 celebrations have become popular in recent years, their origin seems to lie in the 1971 adventures of a group of friends from San Rafael High School in Northern California.

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