What is 420?

420 is cannabis culture’s code number for consuming cannabis, and April 20 (4/20) is its unofficial worldwide holiday.

The term traces to a group of California high schoolers in the early 1970s who used "420" as a meet-up time to smoke, and it spread through Grateful Dead circles into wider culture. Today "4:20" signals a time to consume, and April 20 is marked by gatherings, sales, and events. It has become the cannabis community’s best-known cultural reference.