If you know anything about cannabis culture, you know about the high holiday, 4/20. The origins of 4/20 date back to a group of high schoolers in Northern California in the 1970s. The five friends, who called themselves the Waldos, would meet up at 4:20 to smoke weed together. Their secret code spread through family connections to the Grateful Dead. Eventually, the story of 420 reached High Times and was enshrined in stoner lore. In addition to 4/20, there’s a lesser-known …