The research, published in Environmental Science & Technology (ES&T), a journal of the American Chemical Society, “reports that the aerosols (commonly called vapours) produced by flavoured e-cigarettes liquids contain dangerous levels of hazardous chemicals known to cause cancer in humans”, according to the DRI.
Lead researcher and associate research professor of atmospheric sciences Andrey Khlystov claimed that he had provided evidence linking the flavour agents in eliquids to the production of aldehydes. Keen to grab headlines, he said: ““One puff of any of the flavoured e-liquids that we tested exposes the smoker to unacceptably dangerous levels of these aldehydes, most of which originates from thermal decomposition of the flavouring compounds.”
Following the press coverage, Dr. Farsalinos received a large volume of correspondence from vapers. They were expressing concern over the possibility that eliquid could produce large volumes of aldehydes, comparable (according to Khlystov) or in excess of that found in traditional tobacco cigarette smoke.
He replied: “Remarkably, no aldehyde emissions were found when using an unflavored liquid. Due to the latter, we can safely exclude dry puffs as a reason for the very high aldehyde emissions. If that was the case, they would have found very high levels of aldehyde in unflavored liquids too. I have reported this in a study 1 year ago using unflavored liquid.”
Farsalinos went on to explain that another problem with Khlystov’s study and findings is that it contradicts all of the other research looking at aldehyde production from eliquid. “A large number of studies have shown that aldehydes are formed due to thermal degradation of the main ingredients of e-liquids,” he continued, “namely propylene glycol and glycerol. Even more importantly, John Lauterbach reported in a 2015 conference that radiolabeled aldehydes were found in the aerosol of e-liquids containing radiolabeled PG and VG (abstract 188). This is definite proof that, at least part of, aldehydes are formed due to thermal degradation of the humectants of e-liquids.”
It amplifies the bizarre nature of the DRI’s findings; on one hand unflavoured liquid that should produce aldehydes with dry hits didn’t, and Watermelon managed to produce four times the aldehydes found in cigarette smoke on the other.
But Dr. Farsalinos aims to get to the bottom of it. He has written to Khlystov, asking him for details regarding the methodology, and plans to repeat the experiment. Unfortunately Khlystov has yet to reply to the good doctor, we hope he does as we look forward to the new set of results.