Asbestos is a naturally occurring, fibrous material that is fireproof and heat resistant. It has been used in construction since the early 20th century. Asbestos was banned in the late 1970s because of its health risks. However, it still remains on some buildings today due to its durability and resistance to fire. Asbestos exposure can lead to cancer, lung disease, and other serious conditions. The risk of asbestos exposure increases with age and physical activity.