Missouri became the latest state to legalize medical marijuana on Tuesday night.

The measure, Amendment 2, will alter the state's constitution to allow doctors to prescribe the drug for several different medical conditions. The measure will include a 4 percent tax on marijuana sales, with proceeds being devoted to health care for veterans.

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About 65 percent of voters had approved of the ballot measure with about half of the state's votes counted, according to The Kansas City Star.

“It was a historic day for Missouri patients and veterans,” Jack Cardetti of New Approach Missouri, a group that pushed for the amendment, told the newspaper.

The approval allows for patients ranging from cancer and HIV to Post Traumatic Stress Disorder to get access to marijuana with doctor approval.

The AP reported that Missouri legislative researchers have predicted that more than $100 million worth of medical marijuana could be sold each year.

Missouri is now the 32nd state, in addition to Washington, D.C., to legalize medical marijuana. The measure's approval marks another example of states becoming more open to marijuana for both medical and recreational use.

Voter in Michigan on Tuesday approved a measure to make it the 10th state where adults over the age of 21 can legally use recreational marijuana.