Table 3 Risk of lung cancer in 138 cases and up to 2595 matched non‐cases per case, adjusting for time since first asbestos exposure, cumulative asbestos exposure, and smoking status.

	OR	(95% CI)	p value
Time since first exposed (years)	0.84	(0.81–0.87)	<0.001
Cumulative exposure (log f/ml‐year)	1.17	(1.05–1.30)	0.005
Never smoker	1.00
Ex‐smoker <6 years	22.1	(5.6–87.0)	<0.001
Ex‐smoker 6–9 years	9.3	(2.2–40.1)	0.003
Ex‐smoker 10–19 years	8.9	(2.6–30.1)	<0.001
Ex‐smoker 20+ years	1.9	(0.50–7.2)	0.341
Current <20 per day	6.8	(2.0–22.7)	0.002
Current ⩾20 per day	13.2	(4.1–42.5)	<0.001

Min. non‐cases = 7; max. non‐cases = 494.