Here’s what marijuana researchers have to say about 420 or ‘weed day’ CNNWhat does 4/20 mean? Origin, celebrations, and everything to know ahead of ‘holiday’ The Independent420 origins traced to San Rafael’s ‘Waldos’ KTVU FOX 2 San Francisco420 weed day: Meaning, how April 20 became associated with marijuana USA TODAY4/20 is the busiest time of year for Florida’s medical marijuana dispensaries Yahoo! Voices