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J.G. BACHMAN ; L.D. JOHNSTON ; P.M. O'MALLEY ; PHD ; Institute for Social Research. University of Michigan. Ann Arbor. USA |[BDSP. Notice produite par INIST LUqR0xz6. Diffusion soumise à autorisation]. Objectives. Marijuana use among high school seniors increased during most of the 1970s, decreased throughout the 1980s, and has been increasing again during the 1990s.[...]