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Teenagers' use of drugs, alcohol and tobacco declined in 2016 to rates that are at their lowest since the 1990s, a national study by the University of Michigan has found. The study is of high school students but is an indicator of the patterns of drug and alcohol use of those who will soon enter higher education. The researchers cautioned that while they view most of the trends as positive, marijuana use remains high for high school seniors, and has held steady as the rates of use for other drugs have dropped. Details of the study may be found here.