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code-term used primarily in North America that refers to the consumption of cannabis

420, 4:20, or 4/20 (pronounced four-twenty) is a code word used by people who smoke cannabis to talk about the drug. It is especially used to talk about smoking cannabis at 4:20pm (16:20) in the afternoon, and for the day April 20 (4/20 in the American calendar).[3]

Observed byCannabis counterculture, legal reformers, entheogenic spiritualists
DateApril 20
ObservancesCannabis consumption


  1. "Daily Independent Journal from San Rafael, California". November 20, 1954. Retrieved April 22, 2017.
  2. Chronicle, San Francisco (1962). The San Francisco Chronicle Reader. McGraw-Hill. Retrieved April 22, 2017.
  3. King, Matt (April 24, 2007). "Thousands at UCSC burn one to mark cannabis holiday". Santa Cruz Sentinel. Archived from the original on April 26, 2007.

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