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).

A spokesperson from one of the leading national anti-smoking groups commented: "The more things change, the more they stay the same. This just goes to show that the tobacco industry is still able to unduly influence medical research reporting, even if they are not currently paying their consulting scientists. These conflicts of interest were firmly established in the past and the conflicted scientists continue to do the tobacco industry's bidding."

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