This paper reports the results of a survey conducted on smoking among 1490 eleven years old schoolchildren. They answered to an individual questionnaire before and after they had been informed on smoking by school doctors. In this age group, 26.2% of the children have already had some contact with cigarette, and 0.5% smoke regularly. The household smoking habits have an important influence on the attitude of children toward smoking. Knowledges on smoking dangers have been evaluated before and after information. This survey shows the importance of smoking prevention, especially among young children.