What is a chemical that was widely used to prevent fires but can cause lung disease.?

The chemical that was widely used to prevent fires but can cause lung disease is asbestos. Asbestos was hailed as a wonder material during the 20th century due to its fire-resistant and insulating properties. It was extensively used in construction materials, insulation, shipbuilding, and automotive components, among other things. However, prolonged exposure to asbestos fibers can lead to serious respiratory illnesses, including asbestosis, lung cancer, and mesothelioma. As a result, the use of asbestos has been phased out in many countries, with strict regulations in place to manage its safe removal and disposal.