Figure 3.

Number size distributions (a) and volume distributions (b) versus the mobility diameter produced by vaping two different e-cig liquids (black dotted and black dashed line) and by smoking a conventional cigarette (black solid line). The grey solid line represents the aerosol background inside the 35 m³ room. The distributions of the e-cig liquid correspond to the average of the whole vaping period of each e-cig, while the distribution of the conventional cigarette emissions is the average of 30 min after the concentration has reached the maximum value.