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When researchers first set out to observe data from 141 previous studies, they expected to see a dramatic reduction in the risk of heart disease among one-a-day smokers as opposed to those who smoked a pack a day the equivalent of about 20 cigarettes
Archived from the original on 28 December 2016
Discolouration of the teeth is a common complication of tobacco chewing
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Age, sex, race, and income were considered potential confounders in the relationship between smoking status and the occurrence of disorders based on a theoretical framework illustrated in the constructed Directed Acyclic Graph (DAG) (Supplementary file Figure 1)
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