In order to clarify the generation of cigarette smoke, it is necessary to consider the combustion mechanism of the burning cigarette during a puff. In particular, it is important to understand the role of oxygen transfer. In this presentation, the description of the flow field outside a burning cigarette during a puff and the flow rate distribution will be described. The flow rate outside a burning cigarette during a puff was measured by PIV (Particle Image Velocimetry). Olive oil was used as the tracer particle. There was no flow from the top of the burning cigarette and there was some flow from the neighborhood of the charline. In the neighborhood of the charline, the radial flow rate was about 0.1m/s and the axial flow rate was about 0.03 m/s. The main area where oxygen was supplied was about 2 to 3 mm from the charline. The flow field outside the burning cigarette during the puff was observed for the most common types of cigarette paper. In the case where puff volume (of 2 sec duration) was changed from 10 to 70 ml, the same phenomena were observed. From these results, it is inferred that there is a localized combustion of cut tobacco during a puff near the charline, and the combustion is related to the burning propagation of cut tobacco.