Table 2.

UFPs formation during e-cig experiments vaping sessions with vapers A and B: particles number concentration (#/cm³) at start and stop of the vaping sessions and related increment (Δ).

E-Liquid ID	Vaper A			Vaper B
	UFPs Concentration Vaping Start (#/cm3)	UFPs Concentration Vaping Stop (#/cm3)	Δ (#/cm3)	UFPs Concentration Vaping Start (#/cm3)	UFPs Concentration Vaping Stop (#/cm3)	Δ (#/cm3)
01	7.24 × 103	2.15 × 104	1.43 × 104	1.21 × 104	3.71 × 104	2.50 × 104
02	8.99 × 103	2.27 × 104	1.37 × 104	9.04 × 103	1.56 × 104	6.56 × 103
03	8.28 × 103	3.18 × 104	2.35 × 104	8.33 × 103	1.56 × 104	7.27 × 103
04	1.04 × 104	4.65 × 104	3.61 × 104	8.77 × 103	4.16 × 104	3.28 × 104
05	1.49 × 104	5.50 × 104	4.01 × 104	7.97 × 103	2.41 × 104	1.61 × 104
06	1.22 × 104	4.94 × 104	3.72 × 104	9.55 × 103	2.69 × 104	1.74 × 104
07	1.14 × 104	3.91 × 104	2.77 × 104	1.13 × 104	2.70 × 104	1.57 × 104
08	9.24 × 103	4.26 × 104	3.34 × 104	1.15 × 104	2.43 × 104	1.28 × 104
09	7.41 × 103	3.82 × 104	3.08 × 104	9.07 × 103	2.72 × 104	1.81 × 104
10	1.13 × 104	4.13 × 104	3.00 × 104	1.01 × 104	3.75 × 104	2.74 × 104
11	8.53 × 103	3.50 × 104	2.65 × 104	1.08 × 104	2.54 × 104	1.46 × 104
12	1.09 × 104	3.58 × 104	2.49 × 104	1.28 × 104	2.98 × 104	1.70 × 104
13	7.11 × 103	3.16 × 104	2.45 × 104	1.02 × 104	2.68 × 104	1.66 × 104
13 (2) *	8.35 × 103	2.88 × 104	2.05 × 104	1.15 × 104	3.05 × 104	1.90 × 104
13 (3) *	8.03 × 103	2.74 × 104	1.94 × 104	1.60 × 104	2.94 × 104	1.34 × 104
14	8.87 × 103	3.72 × 104	2.83 × 104	1.38 × 104	3.85 × 104	2.47 × 104
14 (2) *	1.12 × 104	4.37 × 104	3.25 × 104	1.42 × 104	3.69 × 104	2.27 × 104
14 (3) *	1.17 × 104	4.75 × 104	3.58 × 104	1.41 × 104	3.76 × 104	2.35 × 104
15	1.25 × 104	5.11 × 104	3.86 × 104	1.14 × 104	3.49 × 104	2.35 × 104

* replicated measurements.