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Members of the Lewis and Clark Expedition noted "smoking hills" eight miles south of the Vermillion River's mouth today in 1804. It was remnant smoke rising from crevices that once emitted poisonous gas along a 75-mile strip of river from Scalp Creek to the mouth of American Crow Creek. The sulfuric acid, which acts like poison to the lungs, caused Capt. Meriwether Lewis health problems after he inhaled it.