. 2019 Nov 5;322(21):2095–2103. doi: 10.1001/jama.2019.18387

Table 2. Estimated Percentage of Tobacco Use in the Past 30 Days, by Product and School, 2019.

Tobacco Product	High School Students		Middle School Students
Tobacco Product	Unweighted, No.	Weighted % (95% CI)	Unweighted, No.	Weighted % (95% CI)
e-Cigarettes^a	2709	27.5 (25.3-29.7)	902	10.5 (9.4-11.8)
Cigarettes^b	549	5.8 (4.6-7.3)	190	2.3 (1.8-2.9)
Any tobacco product^c	3091	31.2 (29.1-33.5)	1085	12.5 (11.2-13.9)

^{^a}

Past 30-day use of e-cigarettes was determined by asking, “During the past 30 days, on how many days did you use e-cigarettes?” Those who reported using e-cigarettes on 1 or more days of the past 30 days were considered current (past 30-day) users. There were 96 respondents (0.51%) missing data on past 30-day e-cigarette use.

^{^b}

Past 30-day use of cigarettes was determined by asking, “During the past 30 days, on how many days did you smoke cigarettes?” Those who reported smoking cigarettes on 1 or more days of the past 30 days were considered current (past 30-day) users. There were 37 (0.20%) missing data on past 30-day cigarette smoking.

^{^c}

Any tobacco product use was defined as use of any tobacco product (e-cigarettes, cigarettes, cigars, smokeless tobacco, hookahs, pipe tobacco, dissolvables, snus, and/or bidis) on 1 or more days in the past 30 days. There were 13 (0.10%) respondents missing data on past 30-day any tobacco use.