How did 420 become related to marijuana?

(CNN) There is something in the air today. Maybe you've noticed. April 20, or 4/20, is known as "Weed Day" in some circles because the date corresponds with a numerical code for marijuana. Yes, it seems arbitrary. So how did the number 420 come to represent smoking pot? read more

The number 420 has become a popular code for marijuana. Where does the term come from and why did it catch on, asks Aidan Lewis. The number 420 has become a popular code for marijuana. read more

420, 4:20, or 4/20 (pronounced four-twenty) is a code-term in cannabis culture that refers to the consumption of cannabis, especially smoking cannabis around the time 4:20 p.m. (or 16:20 in 24-hour notation) and smoking cannabis in celebration on the date April 20 (which is 4/20 in U.S. form). read more

Both marijuana smokers and non-smokers recognize April 20 or 4/20 as a national holiday for cannabis culture, but few actually know how the date got chosen. Some say “420” is code among police officers for “marijuana smoking in progress.” Some note 4/20 is also Adolf Hitler’s birthday. read more