(September 28, 2021, 2:04 PM EDT) -- CHARLESTON, S.C. — A former firefighter on Sept. 24 sued the 3M Co. and other chemical companies in South Carolina federal court contending that he developed cancer from exposure to per- and polyfluoroalkyl substances (PFAS) in aqueous film forming foam (AFFF), which he says the defendants knew was “highly toxic.”...