http://www.anesi.com/ussbs02.htm
The total tonnage of bombs dropped by Allied planes in the Pacific war was 656,400. Of this, 160,800 tons, or 24 percent, were dropped on the home islands of Japan. Navy aircraft accounted for 6,800 tons, Army aircraft other than B-29s for 7,000 tons, and the B-29s for 147,000 tons. By contrast, the total bomb tonnage in the European theater was 2,700,000 tons of which 1,360,000 tons were dropped within Germany's own borders.
i guess you are right, since google says about 2 million tons were dropped on Laos.
despite the trend that more tonnage is used over time, seems some serious overkill was done there.