The state of California on Thursday sued the manufacturers of a class of chemicals known as “forever chemicals” that are found in a variety of consumer items including food packaging and cookware and are linked to cancer and other illnesses. The chemicals at the heart of the lawsuit are perfluoroalkyl and polyfluoroalkyl substances, commonly referred to as PFAS. They are resistant to environmental degradation, according to the Centers for Disease Control and Prevention, the Environmental Protection Agency, and hundreds of scientific studies.