Rep. Ted Lieu wished those observing a marijuana-themed holiday well on social media.

The cannabis celebration falls on April 20 every year, a reference to the date 4/20. While there are a number of theories about where the holiday originated, CNN reported that it actually corresponds with 4:20 p.m., the time of day when a group of California high school students in the 1970s would smoke marijuana while their parents were not yet home from work.