The number is the highest level of support in almost half a century of surveying adults on the issue, according to Gallup.
In respect to political affililiation, the majority of both Republicans and Democrats now support legalizing the drug. Sixty-seven percent of independent respondents said in this year's poll they back the proposal.
The number of respondents who said they support the legalization of marijuana hit 64% this week, up from 60% in 2016.
Fourteen years ago, public opinion was an inverse image of where it's at today: 64 percent of adults surveyed opposed marijuana legalization, 34 percent said it should be legal and 2 percent had no opinion.
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"As public support for ending marijuana prohibition continues to grow, it is crucial that states continue to be given the freedom to serve as laboratories of democracy", Mr. Fox said.
Advocates in MI are expected to qualify an initiative for the ballot next year that would regulate marijuana for adults, and at least 18 states are expected to have legalization bills introduced during their 2018 legislative sessions. But if more and more Republican voters begin to support pro-marijuana candidates during the primaries, they could begin to shift marijuana policies throughout the United States. For results based on the total sample of national adults, the margin of sampling error is ±4 percentage points at the 95% confidence level. "Over the past several years, Gallup has found that Americans have become more liberal on a variety of social issues". Even larger majorities of independents (67 percent) and Democrats (72 percent) are in favor of legal marijuana.
Legal marijuana now has equal support to gay marriage among Americans, Gallup notes. Sessions has repeatedly criticized marijuana legalization, according to Forbes.
The federal government considers marijuana a Schedule 1 substance with no known medical benefits, but the Trump administration has refrained so far from interfering in states with medical and recreational marijuana laws in place.