Why April 20? There are a few possible explanations for why marijuana enthusiasts’ day of celebration landed on this day, but the real origin remains a bit of a mystery.

Steven Hager, a former editor of the marijuana-focused news outlet High Times, told the New York Times that the holiday came out of a ritual started by a group of high school students in the 1970s. As Hager explained, a group of Californian teenagers ritualistically smoked marijuana every day at 4:20 pm. The ritual spread, and soon 420 became code for smoking marijuana. Eventually 420 was converted into 4/20 for calendar purposes, and the day of celebration was born. (A group of Californians published documents giving this theory legitimacy, but it’s unclear if their claims are valid.)

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