An experiment was carried out in order to quantify the influence of barometric pressure on the sidestream smoke of cigarettes. Two different locations, at + 650 and + 10 m above sea level, and three different cigarettes, including commercial brands and the 1R4F-reference cigarette, were selected for the experiment. A modified 'fish-tail' chimney device was used for the collection of sidestream smoke. Results of mainstream deliveries confirm previous investigations on the topic. Significative differences are found in sidestream yields as a consequence of the influence of barometric pressure. Two different flow rates in the chimney were investigated at the higher altitude laboratory in order to obtain the same sidestream yields as those obtained at the lower one. The increase of flow rate in the chimney is found to be a way to neutralize the influence of a low barometric pressure. Results of mainstream and sidestream nicotine, tar, CO and CO2 obtained in both laborato ries are discussed taking account of the combustion data of cigarettes.