Indoor partitioning and potential thirdhand exposure to carbonyl flavoring agents added in e-cigarettes and hookah tobacco.

Introduction:
This text discusses a study on the partitioning coefficients, which are key parameters determining the chemical behaviors and thirdhand exposures of flavorings. The study investigates the partitioning coefficients of frequently used carbonyl flavorings in e-cigarettes and hookah tobacco, as well as the influence of the hydration process on these coefficients. The findings highlight the importance of reliable laboratory measurements for partitioning data and provide a comprehensive perspective on indoor air quality and indoor chemical exposure.

Key Points:

* The study focuses on the partitioning coefficients of carbonyl flavorings in e-cigarettes and hookah tobacco.
* The two-dimensional partitioning plots were employed to simulate the indoor phase distribution and evaluate the pathways of human exposure.
* The hydration of a-dicarbonyls (diacetyl and 2,3-pentanedione) enhanced their effective henry's law constant (hcp,eff) by a factor of 3.52 and 2.88, respectively.
* The partitioning coefficients are highly sensitive to temperature and the size of indoor reservoirs, indicating that residents are likely to experience thirdhand exposure.
* The indoor partitioning of many harmful flavorings is influenced by temperature and the size of indoor reservoirs, indicating that residents are likely to experience thirdhand exposure.
* The findings provide insight into thirdhand exposures to e-cigarette and hookah tobacco emissions.
* The study emphasizes the importance of reliable laboratory measurements for partitioning data and indoor air quality.

Main Message:
The study highlights the significance of understanding the partitioning coefficients of harmful flavorings in e-cigarettes and hookah tobacco. The findings indicate that thirdhand exposure to these flavorings can occur, even after the vaping or smoking event has ended. The study underscores the importance of reliable laboratory measurements for partitioning data and indoor air quality, as well as the need for further research on the potential health hazards caused by flavoring agents from e-cigarettes and hookah tobacco.

Wu S, Kim E, Vethanayagam D, Zhao R. Indoor partitioning and potential thirdhand exposure to carbonyl flavoring agents added in e-cigarettes and hookah tobacco. Environmental science Processes & impacts. 2022;24(12):2294-2309. doi:10.1039/d2em00365a