[Table], Table 3.7. Age-adjusted relative risks for lung cancer associated with smoking status and smoking cessation among women, cohort studies - Women and Smoking

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Study	Smoking status	Number of years of cessation	Relative risk
Kaiser Permanente Medical Care Program Study 1979-1987	Never smoked	NA ^*	1.0
	Former smokers	2-10	8.4
		11-20	3.8
		>20	4.4
Cancer Prevention Study II 1982-1988	Never smoked	NA	1.0
			Number of cigarettes/day
			1-19	>20
	Former smokers	<1	7.9	34.3
		1-2	9.1	19.5
		3-5	2.9	14.6
		6-10	1.0	9.1
		11-15	1.5	5.9
		>16	1.4	2.6

*: NA= Not applicable.Sources: U.S. Department of Health and Human Services 1990; Friedman et al. 1997.

Women and Smoking: A Report of the Surgeon General.

Office on Smoking and Health (US).

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