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How many cigarettes do you smoke per day?
20.09
Pack years are a unit of measurement used to estimate the amount a person has smoked over their lifetime. It is calculated by multiplying the number of packs of cigarettes smoked per
25.90
Figure 16.1, Total cigarette consumption, United States, 1900–2012 - The Health Consequences of Smoking—50 Years of Progress
26.74
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Pack Years of Smoking and Lung Cancer Risk
29.37
The rise and fall of smoking in rich countries
20.34
Smoking
20.14
Smoking
22.49
