Table 3. Adjusted hazard ratios (95% CI) for incidence diabetes according to baseline smoking intensity ¹ .

	n	Cases	Incidence	Age-adjusted incidence	Attributable risk 2	Model 1 3	Model 2 4
Total	36756
Never smoker	19324	707	10.4	11.2	-	1.00	1.00
Current smoker (cigarettes smoked/d)
1–10	3880	154	11.7	13.5	2.3	1.23 (1.03–1.46)	1.31 (1.10–1.58)
11–20	11604	660	15.7	16.9	5.7	1.37 (1.22–1.53)	1.36 (1.22–1.52)
21+	1948	149	21.5	20.8	9.6	1.51 (1.26–1.81)	1.50 (1.25–1.80)
P for trend						<0.001	<0.001
BMI <23 kg/m2	23432	617
Never smoker	10739	194	5.1	5.7	-	1.00	1.00
Current smoker (cigarettes smoked/d)
1–10	2163	47	6.3	7.7	2.0	1.33 (0.96–1.84)	1.35 (0.98–1.87)
11–20	5807	204	9.6	10.5	4.8	1.50 (1.22–1.85)	1.49 (1.21–1.83)
21+	851	42	13.7	12.4	6.7	1.74 (1.24–2.46)	1.74(1.23–2.45)
P for trend						<0.001	<0.001
BMI ≥23 kg/m2	21971	1566
Never smoker	8585	513	17.0	17.8	-	1.00	1.00
Current smoker (cigarettes smoked/d)
1–10	1717	107	18.9	20.9	3.1	1.26 (1.02–1.56)	1.28 (1.03–1.58)
11–20	5797	456	21.8	23.9	6.1	1.28 (1.12–1.45)	1.28(1.12–1.45)
21+	1097	107	27.7	28.4	10.6	1.49 (1.20–1.84)	1.39 (1.12–1.72)
P for trend						<0.001	<0.001
5 P for interaction							0.07

CI, confidence interval; BMI, body mass index.

¹Analyses excluded former smoker (n = 8647).

²Difference in age-adjusted incidence rate per 1000 person-years between never smoker and current smoker.

³Adjusted for age (years), sex, and worksite.

⁴Adjusted for all factors in model 1 plus BMI (kg/m²), waist circumference (cm), and hypertension (yes or no).

⁵P for interaction for dichotomized variable of BMI (<23 or ≥23 kg/m²) on the association between smoking and type 2 diabetes was based on model 2 and was examined using the likelihood ratio test