Intervention group
	Control group	All	Declined support	Accepted support
Participants*	242	274	185	89
Sex (women)	136 (56%)	157 (57%)	106 (57%)	51 (57%)
Age (years), mean (SD)	50.2 (15.2)	50.4 (14.9)	49.1 (14.9)	53.0 (14.6)
Cigarettes per day at time of enrolment, mean (SD)	11.8 (6.6)	12.8 (8.1)	11.4 (7.1)	15.6 (9.3)
Surgery category
1 (within 30 days)	30 (12%)	29 (11%)	21 (11%)	8 (9%)
2 (within 60 days)	170 (70%)	194 (71%)	129 (70%)	65 (73%)
3 (within 12 months)	42 (17%)	51 (19%)	35 (19%)	16 (18%)

SD = standard deviation.

^*Data provided by 510 participants; three participants in each group declined to be interviewed on the day of surgery.