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

Figure 4

Excess risks predicted by the NEM for the third pattern of changes in smoking habit. NEM predicted ERs are shown for smokers () who cut down markedly at the age of 40 (), increase consumption at the age of 50 (), cut down consumption at the age of 60 (), and quit at the age of 70. The ER is taken to be 10 for at the age of 40. is set at 10 years.