Numerous papers have previously been presented examining the characteristics of filter cigarettes containing activated carbons. These cigarettes have generally been smoked under ISO smoking conditions and little information is available on how the performance of carbon filters is affected at more intense smoking regimes. Under these more intense regimes, the contact times between smoke constituents and the carbon are significantly reduced, thereby leading to a reduced efficiency of removal of smoke vapour phase compounds by the filter. This paper explores the effects of using non-ventilated filter cigarettes containing carbons at different activity levels that have been derived from different precursor materials (coconut and coal) under three different smoking regimes - ISO, Massachusetts and Canadian Intense. The relative retention by the filter of twelve vapour phase compounds - notably carbonyls and hydrocarbons - were measured using a methodology described at previous TSRC conferences. Filters were also tested with two different weights of carbon so that the final experimental matrix could examine the relative influence of carbon weight, carbon activity, carbon precursor material and smoking regime on filter performance. Conclusions concerning the interactions between these various factors will be discussed.