Total U.S. cannabis retail sales on the festive occasion exceeded $37.5 million, marking an almost 30 percent spike in retail transactions since last year’s 4/20 bonanza.

The story of exactly how the exalted stoner holiday blazed into existence is the stuff of skunky legend.

Whether late Grateful Dead frontman Jerry Garcia invented it, or whether it’s meant to commemorate Bob Marley’s birthday, there’s no doubt that April 20 is the day that pot smokers of the world unite to toke up and party.

We do know one thing about this latest 4/20: partakers rolled out another kind of green in celebration -- greenbacks, and a lot of them.

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Kim Lachance Shandrow ~ Entrepreneur.com ~