The number of states that have legalized marijuana could double come November, when voters in five more states will vote on legal weed.
Alaska, Colorado, Oregon, Washington and the District of Columbia already allow recreational marijuana use. In those four states, marijuana can be grown and sold. In D.C., sale is still illegal.
On November 8, Arizona, California, Maine, Massachusetts and Nevada will vote on whether to legalize recreational marijuana use. All five states already allow medical marijuana.