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And 20 more states have legalized medical marijuana: Arizona, California, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York, Pennsylvania, Rhode Island, and Vermont.
Updated 3:47 PM ET, April 30, 2015. Four states -- Alaska, Colorado, Oregon and Washington -- and Washington, D.C. have legalized marijuana for recreational use. Many other states allow some legal use of marijuana, primarily for medicinal purposes.