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. Author manuscript; available in PMC: 2014 Feb 20.
Published in final edited form as: N Engl J Med. 2013 Feb 21;368(8):728–736. doi: 10.1056/NEJMoa1211776

Figure 1. Nonlinear Relationship between Smoking Intensity (Average Number of Cigarettes Smoked per Day) and Lung-Cancer Risk.

Figure 1

Probabilities were calculated on the basis of the following variables: an age of 62 years, white race or ethnic group, some college education, a body-mass index (the weight in kilograms divided by the square of the height in meters) of 27, no chronic obstructive pulmonary disease, no personal history of cancer, no family history of lung cancer, status as a former smoker, smoking history of 27 years, and cessation of smoking 10 years before enrollment.