The tiny fibres from the asbestos are breathed in and settle in the lungs. They often cause cancer of the lungs and this spreads to other parts of the body. It's a nasty disease for which there is no cure. Chemotherapy helps to slow the spread of the cancer and is supposed to improve the quality of life for the person suffering from the disease, but it can have unpleasant after-effects. My late husband decided to stop the chemo after a few months.