Option #4 is correct. 420 started as a secret code amongst a group of friends at San Rafael High School in the early 1970s. 4:20 pm was when they would often meet after school to smoke.

A group of “Deadheads,” who called themselves “The Waldos,” would meet at a statue of Louis Pasteur, and they called their smoke outings “4:20 Louie”. They used to make flyers that they passed out at Grateful Dead concerts and included “420” in the handouts. Eventually, it caught on.

Now, the 420 secret code is not so secret and is displayed on T-shirts and throughout pop culture.

420 is the number of the California Senate bill that established the state’s medical marijuana program.

420 is celebrated amongst marijuana users as reason to smoke with friends on 4/20.

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