Are electronic cigarettes safe?

Electronic cigs have been on the market for a while, but on 'reputable' sources, such as news organizations, the FDA, and other organizations speak against them. Which I don't understand basically the electronic cigarette comes with a nicotine cartridge like the patch that gives you a dose of nicotine.

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Electronic cigarettes are called as smokeless cigarettes or personal vapourisers as they resemble the recent fashioned cigarettes in vogue and shape. The electronic cigarette reviews shows that it’s safer than traditional cigarettes because it do not pollute the air.

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