three articles from the economist on cannabis legalization

http://www.economist.com/news/leaders/21692881-argument-legalisation-cannabis-has-been-won-now-difficult-bit-right?spc=scode&spv=xm&ah=9d7f7ab945510a56fa6d37c30b6f1709

http://www.economist.com/blogs/graphicdetail/2016/02/daily-chart-10

http://www.economist.com/news/briefing/21692873-growing-number-countries-are-deciding-ditch-prohibition-what-comes