Abstract
Summary: The results of 16 published experiments which have investigated the effect of reduced tar and nicotine delivery on cigarette consumption were analysed. Smokers switched to brands of lower delivery were found to have significantly increased consumption, the greatest increases in consumption occurring after the largest reductions in delivery. A linear regression of the data shows the consumption increase predicted for different levels of delivery reduction. The relevance of this data to changes in cigarette consumption taking place in the general smoking population is discussed.