PT - JOURNAL ARTICLE AU - Rileigh Casebolt AU - S Jewel Cook AU - Ana Islas AU - Alyssa Brown AU - Karen Castle AU - Dabrina D Dutcher TI - Carbon monoxide concentration in mainstream E-cigarette emissions measured with diode laser spectroscopy AID - 10.1136/tobaccocontrol-2019-055078 DP - 2020 Nov 01 TA - Tobacco Control PG - 652--655 VI - 29 IP - 6 4099 - http://tobaccocontrol.bmj.com/content/29/6/652.short 4100 - http://tobaccocontrol.bmj.com/content/29/6/652.full SO - Tob Control2020 Nov 01; 29 AB - The e-fluid heated in electronic cigarettes (e-cigarettes) is largely composed of organic compounds, specifically propylene glycol, vegetable glycerin and flavouring compounds. When heated, as it is in an e-cigarette, the chemical species in this fluid have the potential to oxidise into carbon monoxide (CO) and other species. Using diode laser spectroscopy, the concentration of CO in e-cigarette mainstream effluent as a function of e-cigarette power and flavour was measured. Carbon monoxide concentration was found to be a direct function of the power of the resistive heating. At the highest powers testable using commercial e-cigarette components, the maximum CO concentration measured was over 180 ppm. The flavouring compounds in the e-fluid also had an effect on the concentration of carbon monoxide present in the effluent.