Beryllium disease: Beryllium is an extremely lightweight metal that is used in many industries, such as aerospace and electronics. Long-term exposure to beryllium can cause people to become sensitized. Once an individual is sensitized, cont exposure can result in chronic beryllium disease, which involves scarring of the lungs. In a study of the effects of exposure beryllium, workers were categorized by their duration of exposure (in years) and by their disease status (diseased, sensiti normal). The results were as follows: Duration of Exposure