By Kelly Burch, 03/02/18 [The Fix, thefix. com] States where the adult use of marijuana was legalized had an uptick in pedestrian traffic deaths last year, according to a new study. More pedestrians were killed in traffic accidents in 2017 than in any year since 1990, and researchers believe that the legalization of marijuana for adult use may have something to do with the rise in fatalities. According to a study released this week by the Governors Highway Safety Association,