Table 3.

Hazard Ratios for All-Cause Mortality According to Tobacco-Use Behavior Pattern and Frequency of Cigarette Use in the National Health Interview Survey Linked Mortality File, 1991, 1992, 1998, 2000, 2005, and 2010

Tobacco-Use Behavior	Frequency of Cigarette Use
	Nondaily			Daily
	No. of Deaths	HR1a	95% CI	No. of Deaths	HR1a	95% CI
Exclusive current cigarette use	891	1.73	1.56, 1.90	5,885	2.38	2.26, 2.49
Current dual use of cigarettes and cigars or pipe
Nondaily cigar or pipe	32	1.29	0.64, 2.59	205	2.53	2.11, 3.02
Daily cigar or pipe	15	2.44	1.29, 4.60	50	2.88	2.03, 3.09
Current dual use of cigarettes and smokeless tobacco
Nondaily smokeless tobacco	9	2.09	1.08, 4.06	37	2.53	1.75, 3.67
Daily smokeless tobacco	9	1.59	0.85, 2.97	23	2.33	1.55, 3.51
Current poly-use of cigarettes and both cigars/pipe and smokeless tobacco
Nondaily use	—b	1.61	0.38, 6.88	28	2.45	1.58, 3.78
Daily use	7	1.65	0.71, 3.83	14	4.48	2.62, 7.64

Abbreviations: CI, confidence interval; HR, hazard ratio.

^a Estimated with never tobacco users as the referent group (12,713 deaths) and age at interview as the time metric; adjusted for sex, race/ethnicity, education, and survey year. Results were derived from a model that included nondaily cigarette smokers, daily cigarette smokers, and never smokers.

^b Value is suppressed because of the small number of deaths (<5).