Risk from bacteria in lungs increased by vaping

A new health risk associated with e-cigarettes has been identified. Bacteria routinely found in the lungs become more harmful and cause increased inflammation when they are exposed to e-cigarette vape, say researchers from Queen’s University Belfast.

This increase in lung inflammation is due to bacteria made more virulent by exposure to e-cigarette vapour, the three-year study, published in Respiratory Research shows.

Deirdre Gilpin, researcher and lecturer from the School of Pharmacy at Queen’s University and lead author of the research, explains: “There is currently a knowledge gap about whether vaping is harmful, or less harmful than smoking tobacco.

“Bacteria have long been associated with the development of lung diseases, such as bronchitis and pneumonia, where smoking plays a role.

Our study is the first of its kind, which aimed to compare the effect of cigarette smoke and e-cigarette vapour on key lung bacteria.

Vaping has been suggested as a safer alternative to smoking, but there is limited evidence to support this and there are major concerns around it. The European Respiratory Society (ERS) has said there is no evidence alternative nicotine products, like vaping, are safe.

It says a reduced, but continued, exposure to toxicants is a “bad alternative to quitting smoking” and that harm reduction should be used for a minority of high-risk smokers, rather than the general population.

As rates of tobacco smoking have decreased, the number of people vaping has increased. Vapers are not always ex-smokers, and there has been an increase of vaping among young people who have never smoked before.

According to the World Health Organisation, there has been a small, but steady, decrease in the estimated number of smokers globally, to just over one billion, whereas the number of vapers has been increasing rapidly, from about seven million in 2011 to 41m in last year.

The study compared the effect of exposure to cigarette-smoke extract and e-cigarette vapour on levels of inflammation and on the virulence of bacteria commonly associated with lung disease.

The research team found that exposure to both cigarette-smoke extract and e-cigarette vapour increased the potential of bacteria to cause harm in the lungs, in a way that could lead to diseases, such as COPD and asthma.

The researchers also found that changes in bacteria exposed to e-cigarette vapour were similar to, and in some cases exceeded, those observed following bacterial exposure to cigarette smoke, suggesting that there is little difference between cigarette smoke and e-cigarette vapour.

Dr Gilpin added: “This study shows us that vaping may carry the same risk as cigarette smoke, in increasing the susceptibility to bacterial infection.”

Jose Bengoechea, director of the Wellcome-Wolfson Institute for Experimental Medicine and co-author of the study, said: “This is a study with phenomenal public health implications.

“Worryingly, e-cigarette vapour, as well as cigarette smoke, increase the harmful potential of already dangerous infections, in addition to the well-known detrimental effect on lung function.

“At the very least, this work should open a frank debate on vaping safety,” Mr Bengoechea said.