Table 2.

Prevalence Estimates (Weighted n and Percent) for 2019 YRBS Substance Use Variables and Groupings

Substance Grouping	Ever Use		Past 30-d Use
	n	%	n	%
Independent categories
E-cigarettes
No	6624	50	8637	67
Yes	6655	50	4205	33
Missing	472	—	910	—
Cigarettes
No	8945	76	12 329	94
Yes	2833	24	782	6
Missing	3708	—	1360
Marijuana
No	7931	63	10 448	78
Yes	4617	37	2904	22
Missing	2018	—	372	—
Combined categories
Nonuse	4934	44	7677	63
Exclusive use
E-cigarette	1487	13	1750	14
Cigarette	196	2	49	<1
Marijuana	381	3	512	4
Dual use
E-cigarette and cigarette	433	4	165	1
E-cigarette and marijuana	1778	16	1572	13
Cigarette and marijuana	33	1	32	<1
Use of all 3 substances	1898	17	454	4
Missing	4180	100	2244	100

Analytic n do not always add to 13 677 because the weighting procedure can upweight or downweight cases. —, not applicable.