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420 is not the number of chemicals in marijuana. It's not police code for marijuana. It is, however, a mile marker sign that will no long be seen on I-70 in Colorado! From the Urban Dictionary, here's why....
The term 420 originated at San Rafael High School, in 1971, among a group of about a dozen pot-smoking wiseacres who called themselves the Waldos. The term was shorthand for the time of day the group would meet, at the campus statue of Louis Pasteur, to smoke pot. Intent on developing their own discreet language, they made 420 code for a time to get high, and its use spread among members of an entire generation.
I'm sure it will be heard a lot more frequently out there, now that recreational smoking is legal.
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