420 is mostly used and known as a cannabis culture to plan a place & an outing to smoke weed and get high. It has a long history of being associated with weed.
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What do Indians mean when they refer to '420'? - Quora
What's 420 mean? How '70s teens popularized the weed slang - Los Angeles Times
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What do Indians mean when they refer to '420'? - Quora
The Parent's Guide to 420 by Marijuana Education Initiative