text: Since the 1970s, forty years before the public health community, DuPont and 3M were aware that PFAS was “highly toxic when inhaled and moderately toxic when ingested.” Producers used several strategies to influence science and regulation – most notably, suppressing unfavorable research and distorting public discourse.
  In 2018 White House staff and the EPA pressured the U.S. Agency for Toxic Substances and Disease Registry to suppress a study that showed PFASs to be even more dangerous than previously thought.