In their to this response, the authors of the study clarify their reasoning for attacking the cigarette companies, even though they merely complied with the law:

The failure of the Family Smoking Prevention and Tobacco Control Act does call for criticism. But that criticism should not be leveled at the colors Gold, Silver, and Blue. The criticism should be directed at the anti-smoking groups and politicians who sold out the health of the public for political gain.

While the attacks were mostly personal, and not worthy of expounding here, the shred of substance was that more recent studies which compared lung cancer risks of successive cohorts of smokers have found increased risk among more recent cohorts. From these studies, the Surgeon General's report - and these co-authors - conclude that filters must convey an increased risk of cancer.

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