However, the anti-smoking groups did not buy this argument. One organization's spokesperson told me: "The conflict of interest form clearly asks for the disclosure of all financial relationships that could be perceived as biasing an author's opinion, and there is no 36-month limit for such disclosures. Section 5 of the form refers to any and all conflicts of interest, regardless of when they occurred. These researchers are breaking not only the spirit, but also the letter of these policies."

Neither the survey approach or the RCT approach is perfect. Both have major strengths and significant limitations. The best way to proceed is to conduct both types of studies and to synthesize the results across study designs, keeping in mind the methodological strengths and limitations of each individual study. Only by looking at this totality of the evidence can we draw valid scientific conclusions.

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