I There have been numerous studies on risk perception. The psychometric approach, which is a factorial system using two or three elements, has been preferred. This approach is described as concerning the nature of risks, the knowledge of persons exposed to those risks and the effects to which they are exposed (Slovic, Fischhoff and Lichtenstein, 1980; Slovic, 1987). Other authors have looked at risk perception among adolescents, or young adults, by analysing both the nature of their various "problematic" activities and the differences which can exist between risks that are truly incurred and the perception of such risks (Benthin, Siovic and Severson, 1993).Adolescents were questioned on their knowledge of these risks, their consequences, benefits to themselves or others, the possibility of refusing to run them and external control or regulation of them. The results tended to show that the subjects who engaged in these activities said that they well understood the risks and could curb them (the cognitive perspective). There was also evidence of strong peer