A decades-long decline in teenage drinking and smoking continued in 2015 and use of some drugs by eighth-graders and high school students also fell, while marijuana consumption extended a five-year flat trend, according to results of a study released on Wednesday. Teen cigarette smoking fell to its lowest level since the University of Michigan began doing its national survey on licit and illicit substances in 1975, according to a news release on the study, part of a series called Monitoring the Future.
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