Richard Miech, professor at the University of Colorado at Denver, presented the statistics and analysis of his study in a lecture titled “Trends in Illegal Drug Use Over the Past 25 Years: A Cohort or Period Process?” Miech’s statistics were based on a survey of over 700,000 Americans between the ages of 15 and 64.
Roughly 20 percent of Americans between 20 and 24 have smoked marijuana in the past year, but overall drug use has declined generation by generation since the baby boomers.
However, the usage of prescription drugs in a non-medical way has become the second-most common type of drug use among young people and has increased over the past two and a half decades.
Miech said prescription medications are the leading cause of drug use overdose mortality.

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