Using the Negative Exponential Model to Describe Changes in Risk of Smoking-Related Diseases following Changes in Exposure to Tobacco

Figure 5

Excess risks predicted by the NEM for the first pattern of changes in smoking habit but allowing to vary with time. NEM predicted ERs are shown for smokers () who quit at the age of 40, resume at the age of 50 (), quit again at the age of 60, and then resume at a lower consumption at the age of 70 (). The ER is taken to be 10 for at the age of 40. Instead of setting as 10 years (as in Figure 2), is set at 7 years for ages 40–55, 10 years for ages 55–70, and 14 years at older ages.