Thorax doi:10.1136/thoraxjnl-2015-207895
  • PostScript
  • Research Letter

Cherry-flavoured electronic cigarettes expose users to the inhalation irritant, benzaldehyde

Press Release
  1. Maciej L Goniewicz3
  1. 1Institute of Occupational Medicine and Environmental Health, Sosnowiec, Poland
  2. 2Department of General and Inorganic Chemistry, Medical University of Silesia, Katowice, Poland
  3. 3Department of Health Behavior, Roswell Park Cancer Institute, Buffalo, New York, USA
  1. Correspondence to Dr Maciej L Goniewicz, Department of Health Behavior, Roswell Park Cancer Institute, Elm & Carlton Streets/Carlton House A320, Buffalo, NY 14263, USA; maciej.goniewicz{at}
  • Received 4 October 2015
  • Revised 18 November 2015
  • Accepted 24 November 2015
  • Published Online First 28 January 2016


Many non-cigarette tobacco products, including e-cigarettes, contain various flavourings, such as fruit flavours. Although many flavourings used in e-cigarettes are generally recognised as safe when used in food products, concerns have been raised about the potential inhalation toxicity of these chemicals. Benzaldehyde, which is a key ingredient in natural fruit flavours, has been shown to cause irritation of respiratory airways in animal and occupational exposure studies. Given the potential inhalation toxicity of this compound, we measured benzaldehyde in aerosol generated in a laboratory setting from flavoured e-cigarettes purchased online and detected benzaldehyde in 108 out of 145 products. The highest levels of benzaldehyde were detected in cherry-flavoured products. The benzaldehyde doses inhaled with 30 puffs from flavoured e-cigarettes were often higher than doses inhaled from a conventional cigarette. Levels in cherry-flavoured products were >1000 times lower than doses inhaled in the workplace. While e-cigarettes seem to be a promising harm reduction tool for smokers, findings indicate that using these products could result in repeated inhalation of benzaldehyde, with long-term users risking regular exposure to the substance. Given the uncertainty surrounding adverse health effects stemming from long-term inhalation of flavouring ingredients such as benzaldehyde, clinicians need to be aware of this emerging risk and ask their patients about use of flavoured e-cigarettes.

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