From Huffington Post:

But still, the jury is still out on whether the gadgets are safe or not. “Without question, e-cigarettes are safer than traditional tobacco cigarettes,” Joel Nitzkin, of the American Association of Public Health Physicians told the AFP in February. “They deliver nicotine, with only the tiniest traces of other toxic chemicals.” But questions remain over health hazards that we may not even be aware of yet, just like cigarettes before their damaging health effects emerged into public light.

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