"Almost 50% of the general population in Thailand will die with at least traces of asbestos in their lungs, based on one recent study.
Asbestos fibers were discovered in the lungs of 48.5% of those who were part of a one-year, post-mortem analysis done by the Department of Pathology at Ramathibodi Hospital, Mahidol University in Bangkok.
The toxic mineral was found during 97 of the 200 autopsies that were performed at the hospital without regard to occupation, age, sex or cause of death."
I am guessing the OP is Australian, worked with asbestos in the past, might have smoked, in his 70's.