Michigan is the 10th state to legalise recreational marijuana. This map shows every US state where pot is legal.

Skye Gould/Business Insider

Michigan on Tuesday became the 10th state to legalise recreational marijuana, and Utah and Missouri voted to legalise medical marijuana.

Four states voted on marijuana-legalization measures in Tuesday’s midterm elections. An initiative in North Dakota failed.

Marijuana legalization is sweeping the US. In June, Oklahoma voted to legalise medical marijuana, joining numerous other states that have such laws on the books.

In January, Vermont became the first state to legalise marijuana through its Legislature rather than a ballot initiative when the governor signed the bill into law.

Ten states and Washington, DC, have legalised marijuana for recreational use for adults over 21. And 33 states have legalised medical marijuana.

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Marijuana prohibition began 80 years ago when the federal government banned the sale, cultivation, and use of the cannabis plant. It remains illegal at the federal level.

Overturning prohibition is one of the few hot-button topics with widespread support.

A recent poll by the Pew Research Center found that 62% of Americans, including 74% of millennials, said they supported legalizing marijuana.

And 2018 has been a banner year for marijuana legalization in North America.

In October Canada legalised marijuana federally, becoming the first G7 country to do so.

Mexico’s Supreme Court also ruled last month that marijuana prohibition is unconstitutional, paving the way for the country’s new leader, Andrés Manuel López Obrador, to follow Canada’s lead.

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