At some of the mines out west in Idaho and Nevada the same thing was happening with Silica dust.
One of my co-workers here came down with cancer from Asbestos exposure. He got a big settlement and he deserved every penny of it.
I have seen men working in fly ash dust blow their nose and the snot come out looking like dirty toothpaste.
Yes, it WILL kill you.
http://en.wikipedia.org/wiki/Silicosis
This is a REAL disease. My great-uncle, who never smoked, blew in asbestos insulation in ships, and died from this. The kind of lung cancer that it produces is very different than from smoking. There is a form of asbestos that is so bad that a single exposure can cause cancer many years later. Now if diagnoses and illnesses are abused by doctors and lawyers, this is another matter.