Formaldehyde in the gas phase of mainstream cigarette smoke
Factors affecting formaldehyde deliveries in the gas phase of the mainstream smoke of a single puff were studied using Fourier transform infrared (FTIR) spectroscopy. The lighting puff (first puff), which generates significantly more formaldehyde than subsequent puffs, is different from later puffs in terms of tobacco freshness, heating rate, and smoke condensate on tobacco rod. These differences were explored in this study and found to be related directly to the formaldehyde deliveries on a per-puff basis. The results of this study provide an understanding of the causes of the higher level of formaldehyde detected in the first puff. It is important to explore the smoking process on a per-puff basis since it will provide more insight into the smoke chemistry and increase understanding of combustion and pyrolysis in cigarette smoking.