Abstract: The relationship between pressure drop and flow rate in an unlit cigarette is important to design adquate draw resistance of a cigarette. A number of cigarette physical parameters need to be measured based on Darcy and non-Darcy flow to cover both standard kingsize and superslim cigarette rods. In this study, three different cigarette circumferences (kingsize 24 mm, slim 20 mm, superslim 17 mm) were prepared. The effects of rod physical parameters under both constant flow and a standard smoking of 35 mL volume over 2 s on the relationship between pressure drop and velocity were studied. The results showed that:1) Pressure drop under a higher velocity could be more accurately predicted and calculated by the parameters from non-Darcy flow for superslim cigarettes. 2) A transient puffing profile defined by Reynolds number was used to obtain the physical paramenters under Darcy and non-Darcy flow. Compared with the experimental pressure drop measurements, the maximum bias from the calculation method was less than 5%.