The Michigan Regulation and Taxation of Marijuana Act, also known as Proposal 1, was an initiative that appeared on the November 2018 ballot to legalize cannabis in the U.S. state of Michigan. The initiative allows adults 21 and older to possess up to 2.5 ounces (71 g) of cannabis and to grow up to 12 plants at home. The initiative was approved with 56% of the vote.