A change from the standard to a more aggressive smoke testing regime produces a complex mix of changes in the cigarette, including changes in the delivery from the tobacco column to the filter and possibly in the filter's selectivity. These changes lead to higher yields of most smoke components. A study presented at CORESTA in 2005 used published data to compare smoke yields of Hoffmann analytes under two different test regimes for several commercial cigarettes. A 'Yield Ratio' was defined which relates the relative yield of an individual smoke component to the relative yield of nicotine-free dry particulate matter (tar). For many of the smoke components, the yield ratio correlated well with ISO tar delivery for the cigarettes included in that study. Furthermore, the slope of the relationship between yield ratio and ISO tar delivery appeared to be related to the component's physical properties. These observations were based only on cigarette yield data so it was not possible to separate tobacco column effects from changes in the filter or ventilation system performance. In this work, several commercial cigarettes were analyzed at the standard (ISO) and intensive smoking conditions, and at a range of puff volumes and puff intervals with the filter vents closed. The tobacco column delivery and filtration efficiency were determined for selected smoke components at each smoking condition. Analysis of these data enables the role of selective filtration to be separated from other factors that affect the change in yield with alternative smoking regimes.