Figure 2

Comparative smoke analysis of total aldehydes in cigarette smoke ( CS) and water- filtered cigarette smoke ( WF- CS) . (A) Quantification of total aldehydes in CS and WF-CS from 5 cigarettes. Data are expressed as mean values ± SEM and are referred to 4 experiments. P value given above the line represents the significance between CS and WF-CS. (B) Overlay of the HPLC-UV-chromatograms obtained for smoke analysis with the impinger filled with water (blue) and the impinger left empty (red). Peak annotations and fold change are reported in Table 1.