FRANÇAIS :
Le rapport donne les résultats 2005 de l'enquête auprès des élèves de 4ème, de seconde et de terminale. Les résultats portent sur les consommations de drogues licites et illicites mais aussi sur les niveaux de perceptions des risques associés à ces consommations, la désapprobation envers les expérimentateurs et la perception de la difficulté à se procurer des produits. L'échantillon de 2005 représente 49 300 adolescents dans 402 établissements scolaires.

ENGLISH :
Monitoring the Future (MTF), begun in 1975, is a long-term study of American adolescents, college students, and adults through age 45. The need for a study such as Monitoring the Future is evident. Substance use by American young people has proven to be a rapidly-changing phenomenon, requiring frequent assessments and reassessments. Since the mid-1960s, when illicit drug use burgeoned in the normal youth population, it has remained a major concern for the nation. Smoking, drinking, and illicit drug use are leading causes of morbidity and mortality, both during adolescence as well as later in life. How vigorously the nation responds to teenage substance use, how accurately it identifies the substance abuse problems that are emerging, and how well it comes to understand the effectiveness of the many policy and intervention efforts largely depend on the ongoing collection of valid and reliable data. Monitoring the Future is designed to generate such data in order to provide an accurate picture of what is happening in this domain and why. It has served that function quite well for over 30 years. The 2005 Monitoring the Future survey encompassed nearly 50,000 8th-, 10th-, and 12thgrade students in over 400 secondary schools nationwide. The first published results are presented in this report. Recent trends in the use of licit and illicit drugs are emphasized, as well as trends in the levels of perceived risk and personal disapproval associated with each drug. This study has shown these beliefs and attitudes to be particularly important in explaining trends in use. In addition, trends in the perceived availability of each drug are presented. Following this introductory section are a synopsis of the methods used in the study and an overview of the key results from the 2005 survey. Next is a section for each individual drug class, providing figures that show trends in the overall proportions of students at each grade level (a) using it, (b) seeing a great risk associated with its use, (c) disapproving its use, and (d) saying that they could get the drug fairly easily or very easily. Trends for the interval 1991-2005 appear for all grades and for 1975-2005 for the 12th graders. The tables at the end of this report provide the statistics underlying the figures; in addition, they present data on lifetime, annual, 30-day, and (for selected drugs) daily prevalence. For the sake of brevity, we present these prevalence statistics here only for the 1991-2005 interval, but statistics on 12th graders are available for earlier years in other publications from the study. For each prevalence period the tables indicate which of the one-year changes between 2004 and 2005 are statistically significant. A much more extensive analysis of the studys findings on secondary school students may be found in a volume that will be published later in 2006.