Table 1.

E-cigs, e-liquids, operative conditions and relative codes of the experiments.

E-Cig Generation	E-Cig Types	Liquid Characteristics	Resistance (Ω), Voltage (V), Wattage (W) Conditions	E-Cig Code
First	Young Category®, an e-cig with disposable filter, integrated atomizer and cotton already soaked in liquid	Liquidwithout nicotine	*	1e-cig_noN
		Liquidwith a nicotine at 24 mg mL−1	*	1e-cig_N
Second	Smooke®, an e-cig consisting of a high capacity rechargeable battery, with a separate tank	Flavourart Dark Vapure Heaven Juice® without nicotine	*	2e-cig_noN
		Flavourart Dark Vapure Heaven Juice® with nicotine at 18 mg mL−1	*	2e-cig_N
Third	JustFog Q16 Kit®, consisting of a JustFog J-Easy 9® battery and a JustFog Q 16® atomizer (1.6 Ohm). The battery has a capacity of 900 mAh and allows the regulation of the voltage, from 3.4 V to 4.8 V	Dea Velvet® without nicotine	1.6Ω, 3.4V	3e-cig_1.6Ω-3.4V_noN
			1.6Ω, 4.8V	3e-cig_1.6Ω-4.8V_noN
		DeaFlavour Lady In Black® with nicotine at 9 mg mL−1	1.6Ω, 3.4V	3e-cig_1.6Ω-3.4V_N
			1.6Ω, 4.8V	3e-cig_1.6Ω-4.8V_N
Fourth	G 150 Smok Kit® equipped with V8 Baby-Q2 Smok atomizer® (0.15 and 0.4 Ohm). The battery capacity was equal to 4200 mAh, the wattage variable from 1 to 150 W, and the resistance between 0.1 and 3 Ohms	Pacha Mama—Mango Pitaya Ananas® without nicotine	0.15Ω, 25W	4e-cig_0.15Ω-25W_noN
			0.4Ω, 55W	4e-cig_0.4Ω-55W_noN
			0.4Ω, 80W	4e-cig_0.4Ω-80W_noN
			0.15Ω, 50W	4e-cig_0.15Ω-50W_noN
			0.15Ω, 100W	4e-cig_0.15Ω-100W_noN
			0.15Ω, 150W	4e-cig_0.15Ω-150W_noN
		SmookeKannel® with nicotine at 9 mg mL−1	0.15Ω, 25W	4e-cig_0.15Ω-25W_N
			0.4Ω, 55W	4e-cig_0.4Ω-55W_N
			0.4Ω, 80W	4e-cig_0.4Ω-80W_N
			0.15Ω, 50W	4e-cig_0.15Ω-50W_N
			0.15Ω, 100W	4e-cig_0.15Ω-100W_N
			0.15Ω, 150W	4e-cig_0.15Ω-150W_N

* Resistance (Ω), voltage (V), wattage (W) conditions are not settable by the user and not declared by the producers.