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420 4:20 or 4/20 (pronounced four-twenty) is a code-term that refers to the consumption of cannabis and by extension as a way to identify oneself with cannabis subculture or simply cannabis itself. Observances based on the number 420 include smoking cannabis around the time 4:20 p.m. (with some sources also indicating 4:20 a.m.) on any given day as well as smoking and celebrating cannabis on the date April 20 (4/20 in U.S. form).