OBJECTIVE To study the relation between tobacco and alcohol use and exercise, attitudes toward these habits, and the Sensation-Seeking personality trait in students. METHODS A transversal descriptive study was carried out in the city of Lérida in 1990 in a sample of 430 sixth-grade students and 383 eighth-grade students. The sample was obtained by random sampling of aggregates and stratified by the titularity of the school. An analysis was made of the tobacco and the alcohol use, the levels of physical exercise and the attitudes, among other variables, using the FRISC questionnaire. In eighth grade students, the Sensation-Seeking personality questionnaire was added. RESULTS The overall scores for Emotion Seeking (EMS), Disinhibition (DIS), Sincerity, and the overall score for Sensation Seeking (SS) were higher for males. The students most active in sports had more favorable attitudes toward exercise and higher EMS and DIS scores. Smokers and drinkers had favorable attitudes toward these habits, opposed their prohibition, and had higher scores for all the subscales and the overall SS. There was a correlation between favorable attitudes toward tobacco (-0.38) and alcohol (-0.51), and the DIS score. Attitudes toward alcohol also correlated with the overall SS score. CONCLUSIONS There was a close relation between habits, attitudes, and personality. Although the approach for modifying unhealthy habits should be proposed from a multifactorial perspective, the SS questionnaire could be a useful element for detecting persons who feel the need to seek new sensations and refocusing this tendency on healthier habits.