From the Laboratory of Social and Cognitive Psychology (LAPSCO) UMR-CNRS 6024 (Mr Chausse) and Laboratory of Metabolic Adaptations to Exercise in Physiological and Pathological Conditions EA3533 (Mr Chausse and Dr Dutheil), Blaise Pascal University, Clermont Auvergne University; School of Exercise Science (Drs Naughton and Dutheil), Faculty of Health Science, Australian Catholic University; and Preventive and Occupational Medicine (Dr Dutheil), University Hospital of Clermont-Ferrand (CHU).
CORRESPONDENCE TO: Frédéric Dutheil, MD, PhD, Preventive and Occupational Medicine, University Hospital CHU Gabriel Montpied, 58 Rue Montalembert, 63003 Clermont-Ferrand Cedex 1, France; e-mail: email@example.com
FINANCIAL/NONFINANCIAL DISCLOSURES: The authors have reported to CHEST that no potential conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.
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However, e-cigarette users can easily obtain filaments called “coil” with different ohmic values. Subsequently, it is possible for a 3.3-V e-cigarette to obtain the same power of a 5-V e-cigarette. Commonly used filament values are between 0.4 and 2 Ω. Figure 1 compares the possible power of a 3.3- and 5-V e-cigarette, depending on the filament value. When evaporation settings are not optimal (eg, when the heating power is too high), it creates a bad feeling called “dry hit” in users.5 This bad feeling may be related to the formation of formaldehyde. Therefore, further studies should investigate these parameters when studying the composition of the smoke released by e-cigarettes.
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