Assessment of priority tobacco additives per the requirements in the EU Tobacco Products Directive (2014/40/EU): Part 2: Smoke chemistry and in vitro toxicology.

This publication is part of a series of three publications and describes the non-clinical assessment performed to fulfill the regulatory requirement per Art. 6 (2) of the EU Tobacco Products Directive 2014/40/EU under which Member States shall require manufacturers and importers of cigarettes and Roll Your Own tobacco containing an additive that is included in the priority list established by Commission Implementing Decision (EU) 2016/787 to carry out comprehensive studies (European Comission, 2016). This publication contains the results of a literature search, comprehensive smoke chemistry, additive transfer, and in vitro toxicity studies for the 13 priority additives (carob bean extract, cocoa powder, fenugreek extract, fig juice concentrate, geraniol, glycerol, guaiacol, guar gum, liquorice extract powder, maltol, l-menthol (synthetic), propylene glycol, and sorbitol) commissioned by the members of the Priority Additives Tobacco Consortium to independent Contract Research Organizations. Comparisons of the 39 World Health Organisation smoke emissions in smoke from cigarettes with and without priority additives identified some differences that, with few exceptions, were minor and well within the inherent variability of the analytical method observed for the 3R4F monitor cigarette. Most differences were not statistically significant and did not show consistent additive-related increases or decreases. However, test cigarettes with guar gum showed a statistically significant, additive-related increase in formaldehyde and cadmium; test cigarettes with sorbitol showed a statistically significant, additive-related increase in formaldehyde and acrolein; test cigarettes with glycerol showed a statistically significant, additive-related decrease in phenols, benzo[a]pyrene and N-nitrosoanabasine; and test cigarettes with propylene glycol showed a statistically significant, additive-related decrease in phenol and m + p-cresols. These changes were not observed when the additives were tested as a mixture. None of the increases or decreases in smoke chemistry translated into changes in the in vitro toxicity. Comparisons of the in vitro toxicity of smoke from cigarettes with and without priority additives gave some differences that were minor, well within the inherent variability of the assays, not statistically significant, and did not show consistent additive-related increases or decreases. Thus, it can be concluded that the addition of priority additives had no effect on the in vitro toxicity of the cigarette smoke. The results obtained in our studies are consistent with those in scientific literature.