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It is a viscous colorless liquid which is nearly odorless but possesses a faintly sweet taste.

She goes on to say: While there is good evidence that e-cigarettes available as consumer products can help smokers to quit, we also know that up to one in three smokers in the UK has not tried these devices, Smokers have concerns about safety and misperceptions about the relative risks of e-cigarettes compared with tobacco

It has been shown that when e-cigarettes are run at high voltages the vapor produced contains high enough levels of formaldehyde-containing compounds to drastically increase a person's risk of developing cancer this risk can be up to 15 times higher than that incurred by long-term smoking

"They're good because if you leave a cigarette burning or you fall asleep, you don't have to worry about the mattress going up in flames," she said