The origin of 4/20 Weed Day

April 20, or 4/20, is known as "Weed Day" in some circles because the date corresponds with a numerical code for marijuana.
April 20, or 4/20, is known as Weed Day in some circles because the date corresponds with a numerical code for marijuana.

The Hazy History of '420

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The Origin of 420 — 1922 Cannabis