The authors admit this in the paper. They write: "This is a cross-sectional study, which only allows us to identify associations, not causal relationships."

Previously, there was a significant history of tobacco-funded researchers failing to disclose their conflicts of interest. By now doing the same thing, we are blurring the distinction. Now, the public is going to question the integrity of our research, not just that conducted by or supported by the tobacco companies.

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