Voters in Michigan have approved legalizing recreational marijuana. The measure approved yesterday allows people older than 21 to use weed and to grow as many as 12 plants for personal use. The state will issue licenses for dispensaries and other marijuana-related businesses. Taxes on those businesses are expected to generate as much as $275,000,000 a year. Michigan approved medical marijuana a decade ago. It's the 10th state to legalize recreational weed.