5 cigarettes a day really bad Everyone is smoker today (if you go outside). With an AQI reading over 300, spending the next 24 hours outside would be the equivalent of smoking at least 16 cigarettes. A Tobacco smoking - Wikipedia
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Morb Mortal Wkly Rep 2016;65:120511
The Study of Perceptions In the study Perceptions of Harm to Children Exposed to Secondhand Aerosol From Electronic Vapor Products, Styles Survey, 2015, authors assessed the perceptions of e-cigarette aerosol harmfulness

Farsalinos KE, Romagna G, Allifranchini E, Ripamonti E, Bocchietto E, Todeschi S, et al

Other toxic ingredients are found in this harmful mixture including dangerous substances like: Formaldehyde: A group one cancer-causing agent, also used in the preservation of dead specimens, like frogs (Jensen et al., 2015

Even if you smoke or smoked, talk to them about your experience

4.Creamer MR, Wang TW, Babb S, Cullen KA, Day H, Willis G, et al