BBC News - Proof lacking on e-cigarettes' safety, experts warn
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The report authors said consumers should stop using the devices until ongoing safety studies reported back within the next year.
Andreas Flouris and Dimitris Oikonomou, from the Institute of Human Performance and Rehabilitation in Greece, say there have been three main reports on e-cigarette safety - one by US regulators, one by a publicly-funded Greek research institute, and another by a private company in New Zealand.