SFGateIn Colorado, a pot holiday goes mainstreamWashington PostDENVER — The 4/20 stoner holiday is going mainstream in Colorado. Contrails from jet planes passing overhead intersect the National Museum of Art in Washington, Thursday · Photos of the day. Scenes from Holy Week events, South Korean ferry search ...Marijuana tourism booms in Colorado, though officials remain skepticalThe Denver PostDENVER (AP) — The 4/20 stoner holiday is going mainstream in Colorado.Huffington PostMarijuana supporters should admit: Drug is not safeLongmont Daily Times-CallFlorida Today -USA TODAYall 71 news articles »