A Massachusetts mayor was among the first in line at a recreational marijuana store on Tuesday as the state became the first on the East Coast to allow recreational marijuana sales.

David Narkewicz, the mayor of Northampton, Mass., told CBS News that he planned to buy marijuana to preserve it.

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"I am actually going to probably preserve it and display it … because it is historically significant," he said. 

The store in Northampton and another in Leicester, Mass., each began selling recreational marijuana on Tuesday, according to NBC News.

Recreational marijuana was legalized in Massachusetts in 2016, NBC News noted. However, retail stores were required to meet a number of strict state requirements before they could open.

According to CBS News, retail shops in the state can sell customers up to one ounce of flower or 20 servings of edibles. 

"There has been marijuana use going on in the Commonwealth of Massachusetts for a long, long time," Narkewicz said. "What's changing is it's now being regulated. It's now being tested. It's now being strictly monitored. That's really the major change that's happening."

Michigan became the 10th state earlier this month to pass a bill legally allowing adults over 21 to use marijuana for recreational purposes.