Tyler Mallory: Not true.https://www.washingtonpost.com/news/the-watch/wp/2014/08/05/since-marijuana-legalization-highway-fatalities-in-colorado-are-at-near-historic-lows/  Marijuana cannot cause problems as it is an inanimate object.  It has no mind of it's own.  It's people choosing irresponsible behavior whether it's with pot,alcohol,guns,sexual behavior etc,etc that causes problems and not the substance itself.