I remain with my original question: the original study you cited compares aerosols generated by e-cig smokers with the similar sized dust, pollution and soot pa

I remain with my original question: the original study you cited compares aerosols generated by e-cig smokers with the similar sized dust, pollution and soot particles commonly found outside. There is a correct assumption that particles of that size, when found outside in polluted environments, are especially harmful, because of their geometrical properties combined with the fact that they carry harmful substances. Is it correct to compare pm10 generated by combustion engines with pm10 generated by an atomizer that vaporizes a pharmacy-grade pure- and in theory harmless- substance? Would the same instruments have classified as pm10 water droplets of the appropriate size?