While the origins of the term "420" are often debated, people worldwide honor the number by using it to celebrate all things cannabis. Whether it's smoking a joint at 4:20 p.m. or attending a cannabis festival on April 20, 420 is now synonymous with marijuana. Most stick to the story of "The Waldos," in which a group of friends in Northern California, who called themselves "the Waldos," would congregate around San Rafael High School's statue...