In January 2015 a report published as a research letter to the New England Journal of Medicine (NEJM) found that a 3rd generation e-cigarette (an e-cigarette with variable power settings) set to the maximum power and long puff duration generated levels of formaldehyde that, if inhaled in this way throughout the day, would several times exceed formaldehyde levels that smokes get from cigarette.
Media worldwide accordingly reported this new health hazard of e-cigarette. A new study published online today in the scientific journal addiction took a closer look at the NEJM findings in the context of real-world conditions. It concluded that 3rd generation e-cigarette can indeed produce high levels of aldehydes - but only under extreme conditions which human smokes can be expected to avoid because of the immediate unpleasant sensory effects.
Professor Peter Hajek, director of the Tobacco Dependence Research Unit at Barts and The London School of Medicine and Density, UK, says of the Addiction study: "These findings emphasise the importance of making clear the condition in which tests of this kind are undertaken and avoiding sweeping assertions that can mislead the public. Vapers are not exposed to dangerous levels of aldehydes. My reading of the evidence is that e-cigarette are at least 95% safer than smoking. Smokes should be encouraged to switch to vaping."