Table 1.

Comparisons of risk of lung cancer between all current smokers, all former smokers, and lifelong non-smokers in 1990 study

MenWomen
Smoking statusCases/ controlsRatio of risks*No of cases expected without cessation;Cases/ controlsRatio of risks*No of cases expected without cessation
Current smoker379/6021.00379197/2181.00197
Former smoker, by years stopped
<10146/3390.6622268/930.6999
10-1992/3060.4420818/800.2186
20-2931/2210.201528/1440.05166
≥3016/2400.10168
Lifelong non-smoker3/4000.03§324/5420.05§24
Total667/21081132315/1077572
  • * Risk ratio versus current smoker, adjusted for age.

  • † In former smokers, number of cases observed divided by risk ratio.

  • ‡ Women who stopped 20 years ago.

  • § Lifelong risks for non-smokers taken from US prospective study.