IntroductionWith a view to retrieving parameters that measure the sensitivity of participation in the consumption of tobacco to a policy instrument such as prices, this paper investigates whether movements in tobacco prices over the period 1957-1997 have had a significant effect on the propensity to i) start smoking and ii) quit smoking in the Spanish population. The method used consists in analysing the retrospective information supplied by individuals in a pool of the 1993, 1995 and 1997 editions of the Spanish National Health Survey and estimating models for the duration up to smoking (for both smokers and non-smokers), and the duration of smoking (for smokers) where prices, among other covariates such as demographics and proxies for public health policies, enter the specification for the hazard function.The evidence for the Spanish case has an interest that goes beyond that of local policy makers and academics, for the features of the Spanish tobacco market are somewhat different with respect to the average European Union country. Firstly, while the average price of a packet cigarettes has experimented a marked increase in the last two decades, a 20-unit packet of a representative brand still costs 85% as much as the average European Union price after adjusting for purchasing power disparities [1].Secondly, the Spanish tobacco market is characterised by the coexistence of two types of product (which account for more than 95% of tobacco sales): black cigarettes and blond cigarettes. Although these varieties are very similar in terms of nicotine and tar content, availability, advertising and presentation, there exists a big average price gap