Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effects of Manufacturing Variation in Electronic Cigarette Coil Resistance and E-liquid Characteristics on Coil Lifetime and Aerosol Generation

Version 1 : Received: 10 February 2021 / Approved: 11 February 2021 / Online: 11 February 2021 (11:50:14 CET)

A peer-reviewed article of this Preprint also exists.

Saleh, Q.M.; Hensel, E.C.; Eddingsaas, N.C.; Robinson, R.J. Effects of Manufacturing Variation in Electronic Cigarette Coil Resistance and Initial Pod Mass on Coil Lifetime and Aerosol Generation. Int. J. Environ. Res. Public Health 2021, 18, 4380. Saleh, Q.M.; Hensel, E.C.; Eddingsaas, N.C.; Robinson, R.J. Effects of Manufacturing Variation in Electronic Cigarette Coil Resistance and Initial Pod Mass on Coil Lifetime and Aerosol Generation. Int. J. Environ. Res. Public Health 2021, 18, 4380.

Abstract

This work investigated the effects of manufacturing variations including coil resistance, initial pod mass, and e-liquid color on coil lifetime and aerosol generation of Vuse ALTO pods. Random samples of pods were used until failure (where e-liquid was consumed, and coil resistance increased to high value indicating a coil break). Initial coil resistance, initial pod mass, and e-liquid net mass ranged between 0.89 to 1.14 [], 6.48 to 6.61 [g], and 1.88 to 2.00 [g] respectively. Coil lifetime with light color e-liquid was (mean) = 149, (standard deviation) = 10.7 puffs while pods with dark color e-liquid was = 185, = 22.7 puffs with a difference of ~36 puffs (p <0.001). Total mass of e-liquid consumed until coil failure was = 1.93, = 0.035 [g]. TPM yield per puff of all test pods for the first session (brand new pods) was = 0.0123, = 0.0003 [g]. During usage, TPM yield per puff of pods with light color e-liquid was relatively steady while it was continuously decreasing for pods with dark e-liquid. Coil lifetime and TPM yield per puff were not correlated with either variation in initial coil resistance or variation in initial pod mass. The absence of e-liquid in the pod is an important factor in causing coil failure. Small bits of the degraded coil could be potentially introduced to the aerosol. There is a potential correlation of e-liquid color with both coil lifetime and TPM yield per puff. Change of e-liquid color might have been a result of oxidation which changed some nicotine into nicotyrine.

Keywords

aerosol generation; e-cigarette; coil resistance; e-liquid; manufacturing variation

Subject

Medicine and Pharmacology, Immunology and Allergy

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