(HealthDay News) -- Students who use electronic cigarettes by the time they start ninth grade are more likely to start smoking traditional cigarettes and use other tobacco products within a year, according to a new study by the National Institutes of Health published in the Journal of the American Medical Association.
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The study looked at 222 9th graders who had used e-cigarettes or tobacco and 2,308 students who didn't use any e-cigarettes or tobacco.
Within six months, 30.7 percent of those who had used e-cigarettes started using tobacco products, which included cigarettes, cigars or hookahs. By contrast, 8.1 percent of those who had never used an e-cigarette began using tobacco products, the study found.
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