Table 5

Mean number of cigarettes smoked per day and mean serum cotinine level among male daily cigarette smokers^* aged 20 years or older, by smokeless tobacco use status

Smokeless tobacco use	Unweighted sample size	Cigarettes per day		Serum cotinine (ng/ml)
Smokeless tobacco use	Unweighted sample size	Mean	SE	Mean	SE
Every day	11	17.06	3.79	344.20^‡	40.02
Some days	22	17.75	1.62	215.79	22.69
Former	32	22.69^†	1.70	276.74	22.54
Never	761	17.50	0.57	241.51	4.90
Total	826	17.73	0.51	244.72	4.51

National Health and Nutrition Examination Survey, 1999–2006.
↵* Excludes persons using cigars, pipes, or nicotine replacement pharmacotherapy.
↵† Significantly greater than some day smokeless tobacco use or never used smokeless tobacco (p ≤ 0.006).
↵‡ Significantly greater than some day smokeless tobacco use (p= 0.01) or never used smokeless tobacco (p= 0.02).