[Asbestos in the work environment. The occurrence of pulmonary changes among workers exposed to asbestos at an...

A number of workers exposed to asbestos dust for more than three months were medically examined for lung diseases caused by asbestos. A follow-up examination four years later revealed that the lung capacity of these workers was significantly lower than in the normal population. 9% of them showed changes in the lungs caused by asbestos dust, but no case of cancer was discovered. There was no development of significance in these changes during the four years.