Table 1 –

Characteristics for adolescents (age 12-17) and young adults (age 18-24) at Wave 4 of the Population Assessment of Tobacco and Health Study,^a by tobacco use status^b (percentages and means are weighted to reflect U.S. population).

Tobacco Use Status
					Current (past 30-day)
	Never use (N = 12,864)		Noncurrent use (N = 4,413)		Noncombustible use only (N = 787)		Combustible use (N = 2,990)
	Nc	%	Nc	%	Nc	%	Nc	%	p-valued
Sociodemographics
Age
12-14	5,756	38.9	415	6.4	72	7.2	72	1.5	<0.0001
15-17	4,282	28.6	1,213	19.2	306	32.4	445	10.4
18-20	1,959	16.8	1,257	25.2	242	29.7	1,116	33.4
21-24	867	15.7	1,528	49.3	167	30.7	1,357	54.7
Sex
Female	6,565	52.0	2,346	52.9	280	34.9	1,332	42.3	<0.0001
Male	6,299	48.0	2,067	47.1	507	65.1	1,658	57.7
Race/Ethnicity
Whitee	5,939	52.4	2,028	52.6	517	71.2	1,570	58.6	<0.0001
Blacke	1,893	14.1	580	12.5	43	6.2	438	13.7
Othere,f	1,269	11.2	402	9.9	72	8.3	284	8.2
Hispanic	3,763	22.2	1,403	25.1	155	14.3	698	19.5
Relevant medical history
Asthma status
No asthma	10,411	81.4	3,579	82.0	627	80.0	2,445	82.7	0.001
Asthma no meds	1,787	13.7	648	13.9	126	16.0	456	14.5
Rescue inhaler only	203	1.5	78	1.8	9	1.2	35	1.1
Controller meds	463	3.3	108	2.3	25	2.8†	54	1.7
BMI
Underweight	599	5.0	137	3.1	26	4.7†	120	4.0	<0.0001
Normal	7,728	60.1	2,332	52.3	443	53.3	1,452	48.8
Overweight	2,325	18.2	967	23.0	160	21.6	724	24.7
Obese	2,212	16.6	977	21.6	158	20.4	694	22.5
Other likely smoke exposures
Past month marijuana useg
No	12,593	97.8	3,536	80.6	528	68.0	1,515	51.4	<0.0001
Yes	271	2.2	877	19.4	259	32.0	1,475	48.6
	Mean	SE	Mean	SE	Mean	SE	Mean	SE
Past week SHSh exposure	1.6	0.1	3.1	0.2	4.7	0.4	9.2	0.5	<0.0001

^aN = 21,054 adolescents and young adult respondents with complete data on all variables

^bNever use = never used tobacco; Noncurrent use = ever used tobacco, but not in the past 30 days; Noncombustible use only = exclusive noncombustible (e-cigaretteⁱ, smokeless tobacco, or snus) use in the past 30 days; Combustible use = combustible (cigarette, pipe, hookah, or cigar) use in the past 30 days regardless of noncombustible use.

^cUnweighted

^dChi-square test was used for categorical variables and ANOVA was used for continuous variables.

^eNon-Hispanic

^fIncludes American Indian or Alaska Native, Asian Indian, Chinese, Filipino, Japanese, Korean, Vietnamese, Other Asian, Native Hawaiian, Guamanian or Chamorro, Samoan, Other Pacific Islander, and multiracial

^gMarijuana use variable does not distinguish between combustible and noncombustible use.

^hSHS = secondhand smoke

ⁱAt W4, participants were asked about use of any e-products (e-cigarettes, e-cigars, e-pipes, and e-hookah), all of which are referred to as e-cigarettes here.

^†Estimate should be interpreted with caution because it has low statistical precision. It is based on a denominator sample size of less than 50, or the coefficient of variation of the estimate or its complement is larger than 30%.

Supplemental Table 7 reports standard errors for all the weighted estimates presented in this table.