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Consider the scenario and state whether the variable in question is a confounder: A case-control study of the relationship between cigarette smoking and pancreatic cancer.

Consider the scenario and state whether the variable in question is a confounder: A case-control study of the relationship between cigarette smoking and pancreatic cancer. In this study, coffee drinking is associated with smoking and is a risk factor for pancreatic cancer among both smokers and nonsmokers. Is coffee drinking a confounder in this study?

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