Nevada joins California, Arizona, Massachusetts and Arizona as one of five states voting this November on whether to legalize recreational marijuana. If the measure passes, it would allow adults to legally possess up to one ounce of marijuana, or 1/8 ounce of concentrated marijuana, effective January 1st. Local governments could make rules on where marijuana businesses could be located, but couldn't impose blanket bans. The most recent poll on the matter, shows 53 percent of Nevadans support the measure and 39 percent oppose it.