The most common forms of asbestos disease are pleural plaques, asbestosis, lung cancer, and mesothelioma. Asbestosis is a chronic, prolonged lung disease that is caused by continuous inhalation of asbestos particles. However, asbestosis is not cancerous. The second form, mesothelioma is a cancer that attacks mesothelium and is most commonly found in the lung. Mesothelioma is rare or nonexistent in non-asbestos exposed populations but is becoming more common among asbestos-exposed individuals.