COVID-19 concerns have snuffed out public celebrations of marijuana on Monday, an unofficial holiday for smoking cannabis, driving some activities online across the United States.

The significance of April 20, or 4:20 p.m., as a clandestine time to use marijuana is unclear, but became underground code language, according to author Shirley Halperin's book, Pot Culture: The A-Z Guide to Stoner Language and Life.

Since adult-use cannabis has been legalized across the country, more outdoor festivals and events on the date have sprung up. 

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Jean Lotus ~ UPI.com ~