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Koop's "rather sweeping statements" on the subject in the preface to his 1986 report The Health Consequences of Involuntary Smoking , she notes, "gave way in the subsequent 300 pages to much more hedged and nuanced interpretations of scientific studies." At that point, she says, secondhand smoke was "an issue where actual uncertainty existed, where scientists of good faith disagreed on the magnitude of the risk if not on the existence of risk itself." Although Milov leaves readers with the impression that the uncertainty was subsequently eliminated, Grier shows that the scientific case against secondhand smoke has never been as strong as activists and public health officials claimed