Legalizing the use of pot was an unpopular idea when Gallup first asked Americans about it in 1969 -- just 12% at that time said it should be made legal. Support grew in the 1970s but stagnated in the 20% range until the new millennium, when momentum for legalization picked up again. Since 2000, support for legalizing marijuana has trended steeply upward, reaching majority support for the first time in 2013 -- a year after Colorado and Washington voters legalized recreational use of marijuana via ballot initiatives, making them the first states to do so. Marijuana use continues to be illegal at the federal level.

Views that pot should be legalized have also reached new peaks this year among Democrats (75%) and independents (71%). Democrats reached majority-level support for legalization in 2009, and independents did so in 2010.