"A slim majority (53%) of Americans say the drug should be made legal, compared with 44% who want it to be illegal. Opinions have changed drastically since 1969, when Gallup first asked the question and found that just 12% favored legalizing marijuana use. Much of the change in opinion has occurred over the past few years — support rose 11 points between 2010 and 2013 (although it has remained relatively unchanged since then)."
http://www.pewresearch.org/fact-tank/2015/04/14/6-facts-abou...
"A slim majority (53%) of Americans say the drug should be made legal, compared with 44% who want it to be illegal. Opinions have changed drastically since 1969, when Gallup first asked the question and found that just 12% favored legalizing marijuana use. Much of the change in opinion has occurred over the past few years — support rose 11 points between 2010 and 2013 (although it has remained relatively unchanged since then)."