Table 2.

Dose-response relations among men aged 35-69. Values are risk ratios (standard errors) comparing non-smokers with smokers whose most recent habits involved only cigarettes

	Urban: No of cigarettes/day				Rural: No of cigarettes/day
	1-19	20	>20		1-19	20	>20
Mean No of cigarettes/day	9.4	20.0	32.8		10.3	20.0	30.4
(A) Neoplastic:	1.44 (0.02)	1.78 (0.03)	2.53 (0.06)		1.44 (0.04)	1.68 (0.04)	2.31 (0.10)
Lung cancer	2.08 (0.05)	3.59 (0.06)	6.92 (0.14)		2.23 (0.10)	3.65 (0.14)	7.26 (0.32)
Oesophageal cancer	1.76 (0.06)	2.09 (0.07)	2.82 (0.14)		1.43 (0.06)	1.71 (0.08)	2.13 (0.17)
Stomach cancer	1.31 (0.04)	1.38 (0.04)	1.51 (0.08)		1.33 (0.05)	1.56 (0.06)	1.68 (0.13)
Liver cancer	1.36 (0.03)	1.47 (0.04)	1.55 (0.07)		1.46 (0.05)	1.58 (0.06)	1.84 (0.12)
Five minor sites	1.43 (0.05)	1.79 (0.06)	2.14 (0.12)		1.42 (0.10)	1.47 (0.11)	2.14 (0.25)
Other neoplastic	1.16 (0.03)	1.21 (0.04)	1.51 (0.08)		1.26 (0.07)	1.35 (0.08)	1.62 (0.16)
(B) Respiratory:	1.28 (0.03)	1.60 (0.04)	2.14 (0.07)		1.11 (0.04)	1.28 (0.05)	1.81 (0.11)
Chronic obstructive, etc	1.33 (0.03)	1.73 (0.04)	2.34 (0.09)		1.22 (0.05)	1.45 (0.06)	2.10 (0.13)
Respiratory tuberculosis	1.24 (0.06)	1.48 (0.07)	2.03 (0.14)		1.01 (0.06)	1.23 (0.07)	1.57 (0.15)
Other respiratory	1.14 (0.06)	1.29 (0.07)	1.42 (0.13)		0.94 (0.09)	1.00 (0.10)	1.18 (0.22)
(C) Vascular:	1.17 (0.02)	1.18 (0.02)	1.28 (0.05)		1.17 (0.04)	1.24 (0.05)	1.28 (0.10)
Stroke	1.15 (0.02)	1.19 (0.03)	1.28 (0.05)		1.19 (0.04)	1.31 (0.06)	1.26 (0.11)
Ischaemic heart disease	1.30 (0.04)	1.34 (0.04)	1.53 (0.08)		1.34 (0.07)	1.52 (0.09)	1.85 (0.20)
Rheumatic heart disease, etc	1.04 (0.04)	0.94 (0.04)	0.90 (0.08)		0.97 (0.06)	0.84 (0.07)	0.82 (0.16)
(A-C) Subtotal	1.28 (0.02)	1.48 (0.02)	1.93 (0.05)		1.26 (0.03)	1.42 (0.04)	1.87 (0.08)
All deaths	1.21 (0.02)	1.36 (0.02)	1.70 (0.05)		1.18 (0.03)	1.29 (0.03)	1.60 (0.08)
No of deaths*	40 389	35 169	8303		15 969	12 332	2317

^*Excludes 28 658 urban and 35 362 rural smokers who used some non-cigarette tobacco.