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The sole drawback is that it cannot protect these cylindrical rolls from severe pressures

The base still is still made up of propylene glycol (PG) and vegetable glycerin (VG), as both substances are necessary to any liquid to be vapourized in an electronic cigarette: to put it simply, the former is responsible for flavour transfer and the latter for the amount of vapour

Levin, Tobacco Control Lessons (2013) at 474, 480-481

The Hidden Dangers of E-Cigarettes on Oral Health in Conjunction with Dental Implants: A Narrative Review Vorapol Pianjitlertkajorn, Napatsorn Imerb Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology 15

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