What type of insulation is no longer used due to cancer risks from inhalation?

Asbestos is the correct response because it has been widely recognized for its serious health risks, particularly when fibers are inhaled. Exposure to asbestos can lead to several conditions, including lung cancer, asbestosis, and mesothelioma, which is a type of cancer specifically associated with asbestos exposure. As a result, its use has been significantly restricted and banned in many countries, including the United States, due to the grave dangers it poses to human health.

Other insulation materials like denim, fiberglass, and rock wool do not carry the same health risks associated with inhalation of fibers as asbestos does. These materials are considered to be safer alternatives and do not pose cancer risks to the same extent, making them more favorable choices in construction and insulation applications today.