Citric acid has the potential to produce respiratory sensitisers in e- cigarette vapor
Vaping Devices (Electronic Cigarettes) DrugFacts | National Institute on Drug Abuse (NIDA)
E-cigarettes examined: Do they contain formaldehyde?
Study links chronic vaping to progressive lung damage – Harvard Gazette
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E-cigarette | Characteristics, Safety Issues, & Regulation | Britannica
What Are the Differences Between an E-Cigarette and a Vape Kit?
Japan Tobacco begins nationwide e-cigarette rollout next year - Nikkei Asia
UK ECIG STORE | The One Kit E-Cigarette Kit
E-cigarette | Characteristics, Safety Issues, & Regulation | Britannica
E-cigarettes: How they work, risks, and research
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Explosion of e-cigarette battery inside worker's pocket compared to 'fireworks going off' - ABC News