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 (16:20) (with some sources also indicating 4:20 a.m.[1][2]) on any given day, as well as smoking and celebrating cannabis on the date April 20th (4/20 in U.S. form).
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All details taken directly from provider content at http://en.wikipedia.org/wiki/420_(cannabis_culture)
420 Day
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