In 2012, voters in Colorado shocked the political establishment by making the use of marijuana legal for anyone in the state twenty-one years of age or older. In the wake of that unprecedented victory, nationally recognized marijuana-policy experts Steve Fox, Paul Armentano, and Mason Tvert revisit the " Marijuana Is Safer" message that contributed to the campaign of success--as the first edition of this book predicted it would in 2009. In this updated and expanded edition, the authors include a new chapter on the victory in Colorado and updates on a growing mountain of research that supports their position.