On the other hand, brand E is very similar to brand A in these features, and they both present extreme behaviour in the presence of the additives. Consequently, other important characteristics of the cigarettes, DAPT mouse such as the tobacco type and composition, additives included during manufacturing, the paper additives and permeability, which are not specified by the tobacco
companies, may affect their behaviour. In a previous paper  the composition of the smoke evolved from these tobacco cigarettes brands was studied and multivariant analysis was applied to establish relationships among the main features of the cigarette design and the smoke composition. It was shown as some of the variables considered, especially the WTC and also filter and paper length, play an important role in the smoking process. By brands the classification of the studied brands based on the chemical composition of the gas phase and the TPM revealed
that brand C always appeared separated from the other brands, while brands G, H and I form a homogeneous group. Nevertheless, in this work, with the inclusion of the catalyst in the tobacco, the scene is much more complex and such relationships have not been found. Table 4 shows, as an example, the results of the gas fraction analysed by GC/FID in the case of tobacco F, which is the one where the largest reductions were observed, Selleck Lumacaftor while Table 5 shows the results for the compounds condensed in the filters and Vorinostat mw in the CFP, analysed by GC/MS. The results obtained for the other brands are annexed as supplementary data. The distribution of the different
compounds retained in the filters and in the CFP reveals that the filters seem to preferably retain the lighter components, whereas the heaviest are preferably retained in the CFP located thereafter. This trend was also observed in previous works  and  and may be related to the vapour pressure of the different compounds, their affinity for the filter and the traps and their relative concentrations in addition to the pressure fluctuations during and between the puffs  and . In the following, the analysis of liquids is carried out on the sum of the yields obtained in filters plus traps, in order to better represent the additives action. Figure 3 shows the total yields obtained for HCN, 1,3-butadiene, benzene, acetaldehyde from the gas fraction and phenol and nicotine from the liquid fraction. These compounds have been selected because of their high toxicity, since all of them are included in the Hoffman and in the Canadian lists (Hofmann and Hofmann, 1997; ; WHO technical report series 951). According to , HCN is the smoke component presenting the highest index of cardiovascular effects, while 1,3-butadiene is the one showing the highest cancer risk index (CRI).