Figure 9

Map showing structural classes of e-liquid flavour chemicals identified as having the potential to produce acetaldehyde (blue box) with a representative selection of co-products (red circle) and the names of the chemical flavours from which they could be produced (see Supplementary Dataset S6). *For ethyl esters the prediction of CH3CH2O˙ (blue box) indicates the first step in formation of acetaldehyde47.