Washington ? Alcohol and marijuana use among teens is on the rise, ending a decadelong decline, a study by The Partnership for a Drug-Free America found.

The annual survey released today found the number of teens in grades 9 through 12 who reported drinking alcohol in the last month rose 11 percent last year, with 39 percent — about 6.5 million teens — reporting alcohol use. That’s up from 35 percent, or about 5.8 million teens, in 2008.

For pot, 25 percent of teens reported smoking marijuana in the last month, up from 19 percent.

Until last year, those measures for pot and alcohol use had been on a steady decline since 1998, when use hovered around 50 percent of teens for alcohol and 27 percent for pot.