SAN FRANCISCO – A California ballot measure to legalize marijuana for recreational use has lost popularity in the past month, according to the final statewide survey by the Field Poll before the Nov. 2 election.

Support for Proposition 19 has fallen to 42 percent of likely voters, with 49 percent against, according to the results of a Field Poll released today. Last month, those in favor outnumbered opponents 49 percent to 42 percent, the poll said.