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[17] 58% of e-cigarette calls to US poison control centers were related to children 5 years old or less

The researchers caution that this was an initial scoping study, in which they had to rely on health data available for outdoor air particles

Second primary exposure: vaping frequency Our second primary exposure of interest was vaping frequency, operationalized as individuals who vape every day (every-day vapers), individuals who vape some days (some-days vapers), individuals who vaped at least once but no longer vape (ever but no longer vapers), and individuals who never vaped (never vapers), determined by the two questions: Have you ever used an e-cigarette, even 1 time? and Do you now use e-cigarettes every day, some days, or not at all? 25

Whittemore R, Chase SK, Mandle CL: Validity in qualitative research