Summary
Introduction:
This text provides an in-depth analysis of the thermodynamic behavior of an electronic cigarette, focusing on the vaporization of nicotine and the consistency of nicotine delivery. The study employs both numerical and experimental approaches to investigate the behavior of nicotine in e-liquids and emissions. The results have important implications for understanding the performance of electronic cigarettes and the regulation of nicotine delivery.
Key Points:
* The study uses a Rayleigh distillation model to simulate the vaporization of a volume of e-liquid and understand the behavior of chemical species in both liquid and vapour phases during the vaporization process.
* Eleven in-lab e-liquids were made and vaporized using the same operating conditions, and the results were compared with analysis done using 1088 commercial e-liquids.
* The results show a mean nicotine recovery of around 93% with a standard deviation of 12% over more than 1000 tested e-liquids.
* The comparison of these results with simulation suggests a complete vaporization rather than a partial one.
* The consistency of nicotine delivery is verified under laboratory conditions with a controlled and regulated power supply.
* however, in real life, the power units used in vaping products are discharging devices, and the consistency will depend on the number of puffs expected, the power setup, and the battery's characteristics.
* The study also discusses the implications of article 20, item 3.f of the Tobacco Product Directive, which requires that electronic cigarettes deliver nicotine doses at consistent levels under normal conditions of use.
Main Message:
The main message of this text is that the consistency of nicotine delivery in electronic cigarettes is a complex issue that depends on various factors, including the power supply, battery characteristics, and the number of puffs expected. The study provides important insights into the thermodynamic behavior of nicotine in e-liquids and emissions, which can inform the development of regulations and standards for electronic cigarettes. The results suggest that a complete vaporization of e-liquid occurs during the vaporization process, which has implications for the consistency of nicotine delivery. Overall, the text highlights the need for further research to better understand the performance of electronic cigarettes and ensure their safe and effective use.
Citation
Soulet S, Casile C. Thermodynamic behaviour of an e-cigarette: Investigation of nicotine delivery consistency using nicotine yield. Therm Sci Eng Prog. 2022;35:101452. doi:10.1016/j.tsep.2022.101452
