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The first is by taking records on cigarette taxes paid and comparing them to consumer surveys on cigarette consumption

Factors Influencing Smokeless Tobacco Use in Rural Ohio Appalachia

"A bill to protect the public health by providing the Food and Drug Administration with certain authority to regulate tobacco products

doi:10 } : Cite journal requires |journal= (help) "Mortality from Smoking in Developed Countries 19502000: indirect estimates from national vital statistics" (PDF)

It is possible that taking more puffs of the non-charcoal-filtered cigarette did not acutely increase CO, or that fewer puffs on the charcoal-filtered cigarette are associated with greater tobacco exposure