[Table des matières] 1. Executive summary. 2. Methods. 3. Data collection phase and participation. 4. Tobacco. 4.1. Prevalence. 4.2. Reasons for smoking or for not smoking. 4.3. Comparison with other countries. 5. Drinking habits. 5.1. Prevalence. 5.2. Reasons for drinking or for not drinking. 5.3. Comparison with other countries. 6. Marijuana or hashish. 61. Prevalence. 6.2. Reasons for taking drugs and for not taking drugs. 6.3. Relationships between smoking, drinking and taking marijuana. 7. Physical activity outside school hours. 7.1. Prevalence. 7.2. Comparison with other countries. 7.3. Response to statements about sports. 8. Dietary habits. 8.1. Frequency of intake of selected foods. 8.2. Patterns for taking breakfast and lunch. 8.3. Comparison of food intake with other countries. 9. Body weight and perception of body image. 9.1. Prevalence overweight and obesity. 9.2. Self-perceived size, height appearance. 10. Practices during leisure time. 11. Indicators of personal skills and feelings. 12. Indicators of attitudes, behaviors and performance related to school. 13. Relationships between smoking, drug taking, drinking and overweight and selected personal, educational, emotional and other characteristics. 14. Information that students report to receive and wish to receive at school. Appendix: Questions (derived from the standard HBSC) and answers with detailed results by sex and class categories.