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Getty / HAZEMMKAMAL
A survey of younger people suggests that introducing certain restrictions on e-cigarettes may encourage some to use more tobacco products.
E-cigarette use has increased among US teenagers, and it is not clear whether this can lead to more young people using traditional cigarettes. In recent years, the European Union has passed legislation to limit nicotine levels in e-cigarettes, while the US Food and Drug Administration has extended its powers over tobacco products to include e-cigarettes.
To understand what effects possible restrictions would have on the e-cigarette …