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A mysterious illness causing disease of the lungs has affected many veterans of the Iraq and Afghanistan wars who were exposed to open-air burn pits, which were used to burn everything from batteries to body parts. CBS News' Jeff Glor has the story.

A mysterious illness causing disease of the lungs has affected many veterans of the Iraq and Afghanistan wars who were exposed to open-air burn pits, which were used to burn everything from batteries to body parts. CBS News' Jeff Glor has the story.