Public opposition to the war in Afghanistan has hit a new high and is now well above even opposition to the war in Vietnam, according to a new poll.

The CNN/Opinion Research poll shows just 17 percent of Americans support the effort, while 82 percent oppose it.

The eight in 10 Americans who oppose the war is higher than any other recent conflict. As CNN notes, during the Iraq and Vietnam wars, opposition never peaked above seven in 10 Americans.

More recent polling, from March, shows 57 percent of Americans say it was a mistake to send troops into Vietnam.

Nearly all troops are to be removed from Afghanistan by December 2014, but a majority of Americans would like to see the withdrawal happen faster.

Just one-third say the United States is winning the war.