Predicting decreases in smoking with a cigarette purchase task: evidence from an excise tax rise in New Zealand

Menée en Nouvelle-Zélande à partir de questionnaires auprès de 357 fumeurs, cette étude montre qu'un modèle mathématique, incorporant notamment des données démographiques et le nombre de cigarettes consommées quotidiennement par les participants, peut prédire l'effet d'une augmentation de la taxe d'accise sur le comportement tabagique

Résumé en anglais

Background : Tobacco excise taxes are known to be effective in reducing smoking at the population level, but less research has examined how individual smokers respond to changes in tax policy. We ask whether price elasticities for individual smokers, derived from simulated demand curves obtained with a cigarette purchase task (CPT), can predict changes in smoking after a tax increase.

Method : Smokers (N=357) were recruited from four New Zealand cities and interviewed before and after a 10% tobacco excise tax increase.

Results : Simulated demand curves from the CPT were curvilinear and well described by an exponential model. Smokers reported significant reductions in cigarettes/day and addiction scores at Wave 2 (n=226). Local elasticities derived from the demand curves significantly predicted decreases in cigarettes/day after controlling for covariates.

Conclusions : Elasticities from simulated demand curves can predict decreases in consumption for individual smokers after an excise tax increase. Understanding individual differences in tobacco demand curves may help to predict how different groups of smokers will respond to price increases.