The authors of the book "The $3 Trillion War" noted in a conference call on Wednesday that when they first released their findings two years ago, the estimates were widely criticized as being too high. Now, the researchers believe they may have been too low.

Joseph Stiglitz, who received the 2000 Nobel Prize for Economics, and Linda Bilmes, a public policy professor at Harvard University, said the number of veterans seeking post-combat medical care and the cost of treating those individuals is about 30 percent higher than they initially estimated. That, combined with increases in the cost of military medical care and the lagging economy, will likely push the true long-term cost of the war over the $4 trillion mark.

"This may be more of a crisis than the Medicare and Social Security problems we have looming," said House Veterans Affairs Chairman Bob Filner, D-Calif. "It rivals both in the potential impact. This is another entitlement we've committed ourselves to, and it could break the bank."

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