Saturday is April 20, or 4/20, a day that has evolved into a nationwide celebration of marijuana. In the cannabis community, the term 420 is a slang reference to smoking weed.
The term reportedly dates back to the 1970s, when a group of Northern California high schoolers began meeting after classes at 4:20 p.m. to light up.
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Ally Marotti ~ ChicagoTribune.com ~