IF YOU DIDN'T KNOW, It's 4/20.
Marijuana has come a long way. Before being openly celebrated annually on this day alongside instantly gratifying munchies and the greasiest fast food hits, it was widely difficult to obtain because it was mostly imported. When raw botanical medicines became scarce during WWI, Americans turned to growing at home. Here's a 1917 print ad which supports American-grown cannabis as a near-equal substitution to the foreign variety.