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Vaping may be as usual, according to new research.
Flavorings in e-cigarettes may be particularly harmful to the lungs by triggering inflammation, scientists have warned.
Battery-powered vapes, like the Juul, are promoted to a smokers quit the habit.
Aimed at the same thing, said the University of Athens team.
In experiments on mice they found the additives, including flavorings, caused by the inflammation of the skin.
E-cigarettes have been marketed as a 'alternative to fuel tobacco, but new research suggests that their flavoring and additives may be just as damaging to the lungs
Study co-author Dr. Constaninos Glynos said: 'The observed effects in the lungs on e-cigarette vapor exposure in animal models highlight the need for further investigation of safety and toxicity of these conditions worldwide.
They simulate smoking by propylene glycol, nicotine and often flavorings.
Propylene glycol – a colorless and odorless additive – is found in many processed food and beverages. It is also used as a solvent in a number pharmaceutical drugs.
The findings, published in the American Journal of Physiology-Lung Cellular, show e-cigs and refills are not well regulated – and their long-term effects on health are unknown.
So many different times of the day, with each session separated by 30-minute smoke-free intervals.
Dr. Glynos said: "Electronic cigarettes are advertised as a nicotine delivery system or a new smoking cessation tool.
'Our findings suggest that exposure to e-cig vapor can trigger inflammatory responses and adversely affect respiratory system mechanics.
'In many cases, the added flavor of e-cigs exacerbated the detrimental effects of e-cig vapor.'
One or more vapors containing propylene glycol, both this and nicotine or these two ingredients and a tobacco flavoring. A fifth batch just got normal, healthy air and acted as a control.
Some animals in each party and others four weeks (long term).
There was an increase in markers of inflammation, mucus production and altered lung function in all three e-cig groups – after only three days.
But those getting propylene glycol alone has had a negative impact with long-term exposure.
Dr. Glynos, of the University of Athens, said this suggests the additive elicits only a temporary irritation that is supportive.
In addition, two inflammation-producing proteins became elevated in the flavoring group.
Dr Glynos said this is one of the many flavoring components on the market that may not be safe for even short-term use.
The condition of the e-cigs groups alarmed the researchers. The level of oxidative stress – the level of oxidative stress – the level of oxidative stress.
However, respiratory mechanics have been adversely affected only in response to cigarette smoking – and not to e-cig vapor after prolonged treatment.
Dr. Glynos added: 'We have both e-cigs vaping and cigarette smoking negatively impact lung biology.'
His findings follow a British study of this year that is also suggested.
It found some of the effects of chronic inflammatory diseases in the body.
The University of Birmingham is providing the best results for the world of non-smokers and exposed to e-cig fluid, condensed vapor or nothing for 24 hours.
Exposure to the vapor increased cell death and the production of inflammatory chemicals.
And the ability of cells to engulf bacteria has been significantly impaired in those exposed to vapor.
The Centers for Disease Control and Prevention says that e-cigarettes are safer than traditional cigarettes. And they suggest smokers should consider switching to vaping in a bid to help them quit.
But the cause of the disease may cause lung disease, keep people hooked on nicotine, or act as road in to smoking for kids.
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