The bracket they give is, as Retuters reports, is "as low as $175 billion or as high as $523 billion" but there is much more costs than specifically lung impact. Unfortunately, direct link from Greenpeace site to the actual study does not work, but I'll try to find it and see what they say about specific health impact.

See edits/corrections. The breakdown starts on page 91. The effects of air pollution on lungs is discussed on page 85. The breakdown pegs the 'best' estimate for health costs from air pollution at $187 billion per year.

Interestingly, the impact on Appalachia, $75 billion per year, is substantially more than the GDP of West Virginia ($57 billion per year). The economic return of coal mining in Appalachia is very probably net negative.