For nearly a decade, plaintiffs have been filing lawsuits over the alleged environmental and health consequences associated with per- and polyfluoroalkyl substances — sometimes called forever chemicals. Initially, these lawsuits were largely against early manufacturers of Teflon and other common household products. But this landscape is rapidly changing. Recently, the range of lawsuits and companies targeted has expanded to include not only manufacturers but also other companies in the chain of commerce — including those…