The University of Michigan surveys have revealed that current levels of drug use among high school seniors are substantially higher than drug-use levels in the 1970s.

Question

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The Monitoring the Future study, conducted by the University of Michigan, has shown fluctuations in drug use among high school seniors over the years, but not all current levels of drug use are substantially higher than those in the 1970s. For some substances, use has declined or remained relatively stable.

The University of Michigan Surveys Have Revealed That Current Levels