06:14am Tuesday 18 February 2020

Teens' overall substance use declining, but marijuana use rising

“Our analysis shows that public health campaigns are working — fewer teens are smoking cigarettes,” said Stephanie Lanza, professor of biobehavioral health, and scientific director, The Methodology Center, Penn State. “However, we were surprised to find the very clear message that kids are choosing marijuana over cigarettes.”

Lanza and colleagues analyzed data collected from U.S. high school seniors between 1976 and 2013. Nearly 600,000 students were surveyed over this time period as part of the project Monitoring the Future, a long-term ongoing epidemiological study conducted by the University of Michigan. Lanza and her team focused on information reported about the rates of use of three different substances — alcohol, cigarettes and marijuana — over the course of 37 years. They report their results today (July 20) in the Journal of Adolescent Health.

Students were asked about their use of these three substances in the 30 days prior to taking the survey. Overall the researchers found a marked decline in cigarette use, particularly among white teens, and an increase in marijuana use, particularly among black teens.

In 1993, black adolescents were equally likely to use marijuana and cigarettes, and have continued an upward trend in marijuana use since. White adolescents were more likely to smoke cigarettes than use marijuana until 2011, when marijuana usage slightly surpassed that of cigarettes. In 2013, nearly 19 percent of white teens smoked cigarettes, while almost 22 percent used marijuana. At the same time only about 10 percent of black teens smoked cigarettes, but nearly 25 percent used marijuana.

Substance use trends among teens, 1976-2013

Penn State researcher Stephanie Lanza analyzed data collected from nearly 600,000 U.S. high school seniors who were surveyed between 1976 and 2013. Lanza and colleagues focused on the rates of use of alcohol, cigarettes and marijuana during this time. This gallery graphically visualizes some of their results.

  • teenager marijuana use

    Percentages of high school seniors who used marijuana during the last 30 days.

    Image: Kevin Carlini

  • teenage substance use

    Substance use trends among high school seniors from 1976 through 2013.

    Image: Kevin Carlini

  • teenage binge drinking

    Percentages of high school seniors who drank 5 or more alcoholic beverages in a row during the last 2 weeks.

    Image: Kevin Carlini

The rate of teen alcohol consumption has decreased since the mid-1970s, however white adolescents still drink alcohol more than they use any other substance. White teens’ alcohol use remained higher than black teens’ throughout the study period.

In the published paper the researchers included line graphs tracking substance use over the past four decades.

“What will this look like in a few years?” Lanza asked, indicating the two lines representing alcohol and marijuana, respectively, on the graph showing black teens’ use. “All signs point to these two lines crossing within the next few years. This is a decisive shift.”

Students were more likely to use marijuana if they also smoked cigarettes than if they did not, and vice versa. Teens were also more likely to use marijuana if they drank excessively than if they did not, and vice versa.

The researchers intend to continue analyzing teen substance use data. They are particularly interested in looking into a potential correlation between the recent rise of adolescent marijuana use and its legalization in several states.

Sara A. Vasilenko and John J. Dziak, both research associates, The Methodology Center, Penn State, and Nicole M. Butera, graduate student, biostatistics, University of North Carolina at Chapel Hill, also collaborated on this research.

The National Institute on Drug Abuse and the National Cancer Institute supported this work.



Victoria M. Indivero

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