"Engagement with the industry became increasingly unacceptable for researchers whose reputations were tarnished by their industry activities. At the same time, concerns about potential conflicts of interest among scientists increased, and disclosure of consulting activities to universities became the norm, making it more difficult for researchers to maintain secret ties to the tobacco industry. By contrast, when the 1964 report was released, there was little concern that scientists’ results would be influenced by their funding source." ...

Falk et al., in a of the risk for laryngeal cancer, found that: "Higher risks were associated with smoking nonfiltered than filtered cigarettes." For those who smoked filtered cigarettes, the OR was 5.9 (95% CI = 2.4-14.4); for those who smoked non-filtered cigarettes, the OR was 9.0 (95% CI = 3.2-25.1).

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