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

Table 2 Prevalence estimates for combustible cigarettes and e-cigarettes among a probability-based sample of young adults

N	18–20 years
	1125
	W% [95% CI]	EWNP [95% CI] ‡
Combustible cigarettes
Has ever smoked cigarettes^a,b	24.72 [21.18–28.54]	2,980,000 [2,550,000–3,440,000]
Now smokes every day or some days^c	7.22 [5.24–9.67]	870,000 [630,000–1,160,000]
E-cigarettes
Is aware of e-cigarettes^d	89.3 [86.5–91.8]	10,770,000 [10,440,000–11,080,000]
Has ever used e-cigarettes^e,f	34.62 [30.65–38.77]	4,170,000 [3,690,000–4,670,000]
Now uses e-cigarettes every day or some days^g	15.90 [12.96–19.21]	1,910,000 [1,560,000–2,310,000]

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]
^cQuestion shown to participants who had ever smoked. Variable ID: [DESDSS = 1]
^dQuestion shown to all participants. Variable ID: [ECI1 = 1]
^eEven once or twice
^fQuestion shown to participants who had seen or heard of e-cigarettes before this study. Variable ID: [ECI2 = 1]
^gQuestion shown to participants who had ever used an e-cigarette. Variable ID: [DESDES = 1]

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