[truthkeeper]

I heard it was the asbestos in the lining of the boilers he regularly cleaned out during his stint as a Merchant Marine.

[Mila]

“I heard it was the asbestos in the lining of the boilers he regularly cleaned out during his stint as a Merchant Marine.”

Maybe it was a combination of both.

http://www.allaboutmalignantmesothelioma.com/mesothelioma-stories-mcqueen.htm