Article citationsMore>>

Goniewicz, M.L., Knysak, J., Gawron, M., Kosmider, L., Sobczak, A., Kurek, J., Prokopowicz, A., Jablonska-Czapla, M., RosikDulewska, C., Havel, C., Jacob, P. and Benowitz, N. (2013) Levels of Selected Carcinogens and Toxicants in Vapour from Electronic Cigarettes. Tobacco Control, 23, 133-139.
https://doi.org/10.1136/tobaccocontrol-2012-050859

has been cited by the following article:

• TITLE: Chemical Constituents in E-Cigarette Liquids and Aerosols

  AUTHORS: Mohd Naeem Mohd Naeem, Sharifah Mazrah Sayed Mohamed Zain, Catrina Ng, Mohd Fairulnizal Md. Noh

  KEYWORDS: E-Cigarette, Volatile Organic Compounds, Aerosols, E-Liquids, Constituents

  JOURNAL NAME: Journal of Environmental Protection, Vol.11 No.9, September 10, 2020

  ABSTRACT: Electronic cigarettes (e-cigarettes, EC) form an aerosol from the heating element and liquid-containing cartridge. The heating element aerosolizes the refill solutions (e-liquids) when the power source of e-cigarette is pressed. E-liquids consist of combinations of propylene glycol, glycerine, nicotine and flavouring ingredients. Puffing activates the battery-operated heating element in the atomizer and will produce smoke that is similar to conventional cigarette (CC). This study evaluated the chemical composition of e-liquid and aerosol samples available in Malaysia. We analyzed the volatile organic compounds in e-liquids and the aerosols samples from EC using gas chromatography mass spectrometer. Seventy-two EC e-liquids were analyzed through different flavours from more than 60 brands. Samples consisted of 32 nicotine-free (0 mg) and 40 nicotine-containing refill solutions (3 - 12 mg). Overall, 116 compounds were identified from EC e-liquids. On the other hand, 275 compounds were identified from their resultant aerosol samples. There were 42 compounds found in both e-liquids and aerosols. Seven compounds were only found in e-liquids and 38 compounds were only found in aerosols. Propylene glycol was found in all of the e-liquid and aerosol samples. Glycerin was found in 99% of the e-liquid and 100% of aerosol samples. At least 60% of the EC e-liquids and the resultant aerosol contain piperidine, butanoic acid ethyl ester and nicotine. It was also found that at least 9 out of 35 nicotine free labeled e-liquids contain nicotine. Some of these compounds were known to be detrimental to health and were detected in aerosol although they were not present in e-liquids. While some of the compounds are flavouring ingredients, it is necessary to evaluate its long-term effects on EC users.