Two-thirds of Americans support legalizing marijuana, according to a Gallup survey released Monday, marking an all-time high level of support in nearly 50 years of polling on the issue.

Monday's poll found that 66 percent of Americans support legal pot, up slightly from 64 percent a year ago.

A majority of both major parties support legalization, including 75 percent of Democrats and 53 percent of Republicans. Both numbers ticked up slightly compared to a year ago.

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Among independents, 71 percent support legalization.

Support for legal weed among Americans age 55 and older has risen substantially in the last year, up from 50 percent to 59 percent.

The poll was conducted Oct. 1-10 among 1,019 adults and has a margin of error of 4 percentage points.

The poll was completed roughly a week before Canada officially became the second country to legalize the sale of recreational marijuana. Canadian lawmakers voted in June to approve the substance on a recreational basis, ending a 95-year ban.

Monday's Gallup survey tracks closely with a Quinnipiac University poll from earlier this year that showed 63 percent of Americans support legal marijuana.

Nine states and the District of Columbia have legalized the use of recreational pot, and two dozen states have approved medical marijuana.

The substance remains prohibited at the federal level, and Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE has taken measures to crack down on marijuana use.

In January, Sessions rescinded the Cole memo, an Obama-era measure that discouraged federal prosecutors from prioritizing marijuana-related charges in states that had voted to legalize it.