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"Economic interests and the vindication of deviance: tobacco in seventeenth century Europe." Sociological Quarterly 20.2 (1979): 171-182
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As mentioned earlier, cigarettes may go bad over time due to factors like exposure to air, light, and humidity
doi:10.3390/ijerph111111192
If we view chronic cough as an intermediate step along the causal pathway between smoking and lung cancer, adjusting for chronic cough in the analysis could potentially obscure the genuine association between smoking and lung cancer