USC study says teens consuming multiple forms of pot

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LOS ANGELES (CNS) – Most teens who’ve tried marijuana have used the drug in more than one form, including cannabis products that are smoked, eaten or vaped, according to USC research results released today.

The study raises concerns about adolescent health amid a booming cannabis market that touts sleekly packaged products claiming an array of health benefits, according to the researchers.

“Cannabis use in adolescence increases risk for chronic use throughout adulthood, addiction and impaired cognitive development,” said the study’s senior author, Adam Leventhal, a professor of preventive medicine and psychology and director of the USC Health, Emotion and Addiction Laboratory at the Keck School of Medicine of USC.

“In recent years, there’s been a shift in teens’ perception,” he said. “Legalization and commercialization of cannabis are fostering the perception that this drug is not harmful. On my drive to work, I pass an advertising billboard for marijuana delivery right to your house. Marijuana has gone mainstream.”

In a survey of 3,177 10th-graders from the Los Angeles area, Leventhal and his colleagues collected data via questionnaires at 10 Los Angeles area high schools from January to October 2015 — three years before California’s 2018 legalization of recreational marijuana.

Tenth-graders were asked, “Have you ever used the following substances in your life?” Combustible cannabis was worded as “smoking marijuana” (or weed, hash, reefer or bud); vaping was worded as liquid pot, dabbing or weed pen; edible marijuana included drinks infused with THC — the psychoactive compound in cannabis, brownies, butter and oil.

The study found that of the 33.9 percent of students who reported ever using cannabis, smoking it was the most popular, followed by cannabis products that were edible or vaporized. Most 10th-graders — 61.7 percent — who had ever used cannabis used multiple products to administer the drug.

Notably, 7.8 percent of those students who have ever used marijuana had never smoked the substance, but instead ingested cannabis via edibles or vaping.

The study, published in JAMA Network Open, was supported by a grant from the National Institutes of Health and is part of an ongoing project looking at patterns of substance use and mental health over time.

“A key question is whether a new pool of teens who’ve traditionally been at lower risk for smoking marijuana have been drawn to using the drug in these alternative non-smoked forms,” Leventhal said.

In other words, cannabis products such as bubblegum-flavored vaping liquid may appeal to teen users who would otherwise be turned off by the smell or harsh sensation of marijuana smoke, the research suggested.

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