The other interesting thing is that mesothelioma can result from a single exposure to inhaled asbestos over 20 years in the past.
I keep thinking they're missing something here... If the genetic changes to which you refer can in this case be produced by a solely mechanical agent, the process of cancer development in this case has to be entirely produced by the body's "normal" processes for dealing with foreign objects, when it becomes so "overworked" over a period of many years attempting to deal with foreign objects of which the leukocytes cannot dispose. It seems to me there's a key piece of evidence of the process for mutation there which may be being overlooked.
No $ to be made telling folks such simple solutions to things.
Better to support big money mysterys.