Lung cancer risk by smoking status

	Smoking category
	Heavy smokers	Reducers	Light smokers	Ex-smokers	Never smokers
Adjusted hazard ratio* (95% CI)	1.00	0.73 (0.54-0.98)	0.44 (0.35-0.56)	0.17 (0.13-0.23)	0.09 (0.06-0.13)

Heavy smokers: ≥15 cigarettes or equivalent tobacco per day.
Reducers: Heavy smokers who decreased by ≥50 percent.
Light smokers: 1 to 14 cigarettes or equivalent tobacco per day.

* Multivariate analysis adjusted for sex, cohort of origin, inhalation habits (yes/no), tobacco type (cigarettes, cigars/pipe/cheroots, mixed), and years as smokers (continuous).

Data from: Godtfredsen N, Prescott E, Osler M. Effect of smoking reduction on lung cancer risk. JAMA 2005; 294:1505.

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