“…selected indoor air constituents were measured -the concentrations of respirable suspended particles, ultraviolet particulate matter, fluorescent particulate matter, solanesol, 3-ethenylpyridine, formaldehyde, acrolein, crotonaldehyde, acrylonitrile, benzene, 1,3-butadiene, isoprene, toluene, CO, NO and NO x after the use of THS2.2 under 3 environmental conditions were equivalent to the concentrations found in background indoor air -THS2.2 use resulted in increased acetaldehyde and nicotine concentrations in indoor air, but these concentrations were considerably lower than those found in conventional cigarettes The tobacco industry claims that the aerosol formed during the heating process has around 90-95% lower levels of toxicants than conventional cigarette smoke [13][14][15]23,24]. This was partially confirmed by independent studies [27,28]. Li et al reported that, compared to conventional cigarettes, IQOS delivered a > 90% lower concentration of harmful and potentially harmful constituents (HPHCs) except for carbonyls, ammonia, and N-nitrosoanabasine, where the levels were about 50-80% lower [27].…”