Figure 5. PLCO_m2012-estimated risks for high-risk individuals by smoking quit time in former smokers.

Estimates were prepared for white former smokers who are 68 y old, are high-school graduates, have a body mass index of 27 kg/m², have no family history of lung cancer, have no personal history of cancer, started smoking at age 14 y, and smoked on average 30 cigarettes per day. As the quit time increases, smoking duration correspondingly decreases. The dotted horizontal line indicates the PLCO_m2012 ≥0.0151 risk threshold. PLCO_m2012 refers to the lung cancer risk prediction model described in [11].