April 20 marks 420 Day with tens of thousands of Americans celebrating

the unofficial holiday honoring marijuana.

in 2009 that the holiday started in honor of a ritual performed by California teenagers in the 1970s.

The then-high school students are said to have smoked marijuana every day at 4:20 p.m.

and the number 420 became code for smoking the plant,

with 4/20 being acknowledged for calendar purposes.

A far less popular theory traces the 420 origin to the 1939 short story

In the Walls of Eryx by H.P. Lovecraft and Kenneth Sterling,

which describes "curious mirage-plants" that seem to resemble marijuana as getting the narrator high at 4:20,

As of April 20, 2022, recreational marijuana is legal in 18 states and Washington, D.C.,