WASHINGTON, D.C. -- Thirteen percent of U.S. adults tell Gallup they currently smoke marijuana, nearly double the percentage who reported smoking marijuana only three years ago.

Although use of the drug is still prohibited by federal law, the number of states that have legalized recreational marijuana use has grown from two in 2013, Colorado and Washington, to four today -- with the addition of Alaska and Oregon -- plus the District of Columbia.

Five states will vote on whether to legalize marijuana this November. Half of U.S. states (including the four above) have some variation of a medicinal marijuana law on the books, and four more will be voting this fall on whether to legalize marijuana for medicinal use.

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Justin McCarthy ~ Gallup.com ~