When it comes to assessing the impact of e-cigarettes, estimates of device prevalence matter: the BIDI Stick disposable device

Table 1 Prevalence estimates for combustible cigarettes and e-cigarettes among a probability-based sample of youth

N	13–17 years
	1215
	W% [95% CI]	EWNP [95% CI]^‡
Combustible cigarettes
Has ever smoked cigarettes^a,b	11.15 [9.25–13.29]	2,350,000 [1,950,000–2,800,000]
Has smoked in the past 30 days^c,d	3.50 [2.46–4.83]	730,000 [510,000–1,020,000]
E-cigarettes
Is aware of e-cigarettes^e	88.6% [86.4, 90.5]	18,720,000 [18,250,000–19,120,000]
Has ever used e-cigarettes^f,g	14.64 [12.48–17.02]	3,090,000 [2,630,000–3,590,000]
Has used e-cigarettes in the past 30 days^c,h	6.73 [5.26–8.48]	1,420,000 [1,110,000–1,790,000]

N unweighted number of participants, W% weighted percentage, CI confidence interval, and EWNP estimated weighted number of persons
^‡Rounded down to the nearest 10,000 persons
^aEven one or two puffs
^bQuestion shown to all participants. Variable ID: [CIG1 = 1]
^cOn at least one of the past 30 days
^dQuestion shown to participants who had ever smoked. Variable ID: [DNYTSSS = 1]
^eQuestion shown to all participants. Variable ID: [ECI1]
^fEven once or twice
^gQuestion shown to participants who had seen or heard of e-cigarettes before this study. Variable ID: [ECI2 = 1]
^hQuestion shown to participants who had ever used an e-cigarette. Variable ID: [DNYTSES = 1]

ISSN: 1477-7517