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By this standard, should we not believe that smoking causes lung cancer? After all, a controlled experiment on humans has never been done.


Those studies aren't similar in methodology or subject at all. Can you acknowledge there are unmeasured social factors at play in this simple survey analysis, or not?

If so, I'm happy to speculate about the epistemology of tobacco studies.


> Those studies aren't similar in methodology or subject at all.

They both used observational health data to create a causal conclusion on mortality. How is that not a similarity in methodology?




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