The CORESTA Smoking Behaviour Sub-Group conducted a study to determine if various human puffing topography devices deliver comparable results for puff volume and puff duration. Commercial and proprietary smoking topography instruments have been available and used for many years but there is limited information regarding validation of instruments used. The study measures puff volume and puff duration with four different types of human topography devices, using two commercial cigarettes that represent the low and higher end pressure drops (PD) of commercial products. The data collected was used to determine the accuracy of each device.