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Almost one-third of adverse-event reports for e-cigarettes are related to secondhand exposure, according to a US Food and Drug Administration (FDA) analysis.

The numbers are increasing, and complaints are consistent with airway irritation, nicotine exposure, and possible nicotine toxicity.

"We need to start to understand these products better, not only in users, where we have very few data, but also in nonusers," said Beth Durmowicz, MD, medical officer at the FDA, who presented the research here at the American Academy of Pediatrics 2014 National Conference and Exhibition.

The findings suggest that, as with traditional cigarettes, parents should keep e-cigarettes away from children and avoid using or recharging them near young people.