What exactly is 4/20?

Regardless if you're a marijuana smoker or not, nearly everyone knows of (or has at least heard of) 4/20 as a national holiday within the cannabis communities. But we're here to ask, why April 20? What's the significance of that date? Furthermore, what's the history of this marijuana holiday?

Below we've put together an infographic to answer those very questions.

History of 4/20 Marijuana Holiday Infographic:

420 marijuana holiday

*Information based on data gathered from TIME.

How are you celebrating 4/20? Light up the comments below.