E-cigarettes ‘poison the airways and weaken the immune system’
ELECTRONIC cigarettes expose the lungs to toxicity, reduce the effective ness of the immune system and encourage bacterial activity, potentially making superbugs more deadly, according to research published in the Journal of Molecular Medicine. In the US, the use of e-cigarettes tripled from 4.5% in 2013 to 13.4% in 2014 among high school students, and from 1.1% in 2013 to 3.9% in 2014 among middle school students, surpassing rates of youth cigarette smoking. In the 25-44-year age group, 20% of Americans smoke ecigarettes.
While teens smoke them because they are trendy, older smokers are turning to them in an attempt to give up smoking. Interestingly, many teens who smoke e-cigarettes then move on to conventional cigarettes just 1 year later, as reported recently by Medical News Today. In using the device, smokers are risking their airways and immune systems. They are also enhancing the conditions for colonizing bacteria, including some deadly strains.
Researchers at the University of California-San Diego (UCSD) carried out mouse studies to examine the effects of e-liquids from seven different manufacturers. The scientists exposed mice to e-cigarette vapours for 1 hour a day, 5 days a week over 4 weeks. Results showed that inflammatory markers in the airways and blood of mice after inhaling evapours were 10% higher than those in unexposed mice. Bacteria that had been exposed to e-cigarette vapour were more virulent in mice infected with pneumonia.
When mice were infected with normal methicillin-resistant Staphylococcus aureus (MRSA), an antibiotic-resistant “superbug,” they survived; but 25% of mice that were infected with MRSA after being exposed to e-cigarette vapor died. In other words, S. aureus becomes more virulent when exposed to e-cigarette vapor. The researchers observed that exposing bacterial pathogens to e-cigarette vapour caused them to thrive. The vapour helped S. aureus bacteria to form biofilms, to adhere to and invade airway cells and to resist the defenses of the human immune system.
Some of the changes observed in mice are common to those seen in the airways and blood of conventional cigarette smokers. Others are characteristic of human cancers or inflammatory lung disease. “This study shows that e-cigarette vapor is not benign; at high doses, it can directly kill lung cells, which is frightening. We already knew that inhaling heated chemicals, including the e-liquid ingredients nicotine and propylene glycol, couldn’t possibly be good for you. This work confirms that inhalation of e-cigarette vapour daily leads to changes in the inflammatory milieu inside the airways.”
Dr. Crotty Alexander says it is not yet clear which lung and systemic diseases will be caused by inhaling e-cigarette vapour, but data suggest that acute toxicities will result from the inflammatory changes involved.