According to a recent study, e-cigarettes emit harmful chemicals with some models releasing more than others.
The study was published in the journal Environment Science & Technology,
and it found emissions of toxic chemicals escalate as e-cigarettes get hotter
The study analysed three different types of e-liquids in two different vaporizers operated at various battery power settings, using a custom-built device that emulated realistic vaping.
One e-cigarette was a cheaper model with a single heating coil, the other was more expensive with two coils. Researchers drew on each e-cigarette by taking puffs lasting 5 seconds every 30 seconds.
Examination of the vapour shown dramatically increased emission from the first initial puffs to later puffs when the device had reached a hotter “steady" temperature. To discover what was in the vapour, researchers used gas and liquid chromatography.
A single-coil e-cigarette operated at 3.8 volts emitted 0.46 micrograms per puff in the first five puffs, but at the "steady" state - after around 20 puffs - it emitted 8.7 micrograms per puff.
"When you apply the same voltage to the double-coil e-cigarette you see a lot less emissions," said co-author and Berkeley Lab researcher Lara Gundel. "We think it has to do with lower temperatures at each of the coil surfaces."
Assuming 20 puffs on an e-cigarette is equivalent to smoking a conventional cigarette, said Dr. Gundel, the total emissions of acrolein for an e-cigarette are about 90 to 100 micrograms. Conventional cigarettes emit 400 to 650 micrograms of acrolein per cigarette.
Emissions of chemicals in e-cigarette vapour such as formaldehyde, acetaldehyde, and acrolein - all carcinogens or respiratory irritants – increased with usage.
Despite the findings, earlier this year a major report by the Royal College of Physicians concluded e-cigarettes are beneficial to public health and smokers should be encouraged to use them.
The 200-page report concludes that “among smokers, e-cigarette use is likely to lead to quit attempts that would not otherwise have happened”.
An estimated 2.1 million Britons use e-cigarettes; a figure which is steadily rising. Since their introduction in 2007, they have been marketed as successful tools to wean smokers off nicotine addiction as they reflect the sensation and practice of smoking while giving lower nicotine doses.
source - http://www.independent.co.uk