"Substance use is a main predictor of educational outcomes, including absenteeism," said first study author Melanie Dove, an assistant adjunct professor of public health sciences at UC Davis. "These results highlight the need for comprehensive efforts to prevent and reduce substance use from both cannabis and tobacco products among youth."
Classmates who used one substance also had poorer grades than abstainers. Tobacco users averaged 5.6; cannabis users averaged about 5.5 — or mostly B's for both groups. "For young people who are not current users but are exposed to use by others, the aerosol from these products is not harmless, and contains potentially harmful chemicals, heavy metals and fine particulates," she added in a UC Davis news release.The results differ sharply from those of the 2022 California Youth Tobacco Survey. In that survey, 6.6% of students said they use tobacco — a much higher rate than the current study but well below the 12.6% national average.
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