Table 1

Cigarette smoking within the 30 days preceding the survey, by number of days of smokeless tobacco use within the preceding 30 days

Number of days used smokeless tobacco in the preceding 30 days	Unweighted sample size	Number of days smoked cigarettes of preceding 30 days
		All 30 days		1–29 days		0 days
		%	SE	%	SE	%	SE
Middle school^*
All 30 days	42	53.8	8.1	15.3	6.5	30.9	8.6
1–29 days	140	9.3	3.0	39.3	4.3	51.3	5.1
0 days	6327	0.7	0.1	5.5	0.4	93.9	0.5
Total	6509	1.2	0.2	6.4	0.5	92.4	0.6
High school^†
All 30 days	105	32.1	5.1	27.8	5.0	40.2	6.1
1–29 days	348	26.3	2.9	32.7	2.7	41.0	3.5
0 days	5804	5.4	0.6	11.6	0.7	83.0	1.0
Total	6257	7.6	0.7	13.5	0.7	79.0	1.2

Male middle school students (grades 6–8) and high school students (grades 9–12). National Youth Tobacco Survey, 2004.
↵* χ² test of independence between smokeless tobacco use and smoking=39.65 (df=4), p<0.00001.
↵† χ²=55.51 (df=4); p<0.00001.