Question: Refer to the smoking case-control study in Example 9. Since subjects were not matched according to all possible lurking variables, a cigarette company can argue

Refer to the smoking case-control study in Example 9. Since subjects were not matched according to all possible lurking variables, a cigarette company can argue that this study does not prove a causal link between smoking and lung cancer. Explain this logic, using diet as the lurking variable.

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