TABLE 3.

Approximate 10-year risk of developing lung cancer. These tables assume that people who have quit smoking will remain nonsmoking for an additional 10 years and current smokers will keep smoking the same amount for the next 10 years. For individuals with occupational asbestos exposure, the risks should be multiplied by 1.24. Adapted from Bach PB et al.[20]

Duration of smoking	25 years former smoker	25 years current smoker	40 years former smoker	40 years current smoker	50 years former smoker	50 years current smoker
Age (yrs)	1 pack per day smoker
55	< 1%	1%	3%	5%	NA	NA
65	< 1%	2%	4%	7%	7%	10%
75	1%	2%	5%	8%	8%	11%
	2 pack per day smoker
55	< 1%	2%	4%	7%	NA	NA
65	1%	3%	6%	9%	10%	14%
75	2%	3%	7%	10%	11%	15%