Americans' support for the decade-long Afghanistan war has dropped to an all time low, with a majority saying the situation in Afghanistan has turned into another Vietnam, a new national poll showed Friday.

Only 34 percent of those surveyed said they support the war in Afghanistan, one point less than the previous low of 35 percent, with 63 percent being opposed to the conflict, according to the CNN/ORC International Poll.

Fifty-eight percent said that the war in Afghanistan has turned into a situation like what the U.S. faced in Vietnam, the survey showed.

It also found that Americans' opposition to the war is more due to what Afghanistan has turned into in the past decade rather than the decision to launch the war.

The result was unveiled at a time when the Obama administration has began to pull out troops from the central Asian country this summer.

Under the president's withdrawal plan, 10,000 U.S. troops will leave Afghanistan by the end of this year and another 23,000 will return home by September 2012. The ultimate goal is to transfer lead security responsibility to the Afghan forces by 2014.