Yawen Li1, Huapeng Cui  1, Li Chen1, Meijuan Fan1, Junlan Cai1, Junwei Guo1, Caner U. Yurteri2, Xiaoxi Si3, Shaofeng Liu1, Fuwei Xie1, Jianping Xie1

1 Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
2 Research and Development, British American Tobacco Investments Ltd, Regents Park Road, Southampton, Hampshire SO15 8TL, UK
3 R&D Center of China Tobacco Yunnan Industrial Co., Ltd., Kunming, China


Received: August 4, 2020
Revised: November 26, 2020
Accepted: December 1, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.200241  


Cite this article:

Li, Y., Cui, H., Chen, L., Fan, M., Cai, J., Guo, J., Yurteri, C.U., Si, X., Liu, S., Xie, F., Xie, J. (2021). Modeled Respiratory Tract Deposition of Smoke Aerosol from Conventional Cigarettes, Electronic Cigarettes and Heat-not-burn Products. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.200241


HIGHLIGHTS

  • Physical properties of aerosol generated by cigarette, e-cigarette and HNB product.
  • Deposition of three types of aerosol in the human respiratory tract.
  • Higher deposition fraction caused by the e-cigarette aerosol.
 

ABSTRACT


Knowledge of the deposition of inhaled smoke aerosol in the human respiratory tract has great value for risk assessments of the inhalation toxicology of tobacco products. In this study, differential mobility spectrometry (DMS) was used to characterize smoke particles generated from a conventional cigarette, e-cigarette and heat-not-burn product. The aerosol properties obtained by DMS were then applied to a Multiple Path Particle Dosimetry (MPPD) model to predict the deposition of aerosol particles in the human respiratory tract. The DMS results showed that the particle size distribution of aerosol from the three products differed considerably, with a count median diameter of 14.2~25.4 nm, 50.6~55.3 nm and 172~179 nm for the e-cigarette, heat-not-burn product and conventional cigarette, respectively. However, there was no significant difference in the particle number concentration of aerosol from the three products. The MPPD model indicated that the total deposition fraction of aerosol particles from the e-cigarette and heat-not-burn product was higher than that from the conventional cigarette, and deposition of particles from the e-cigarette in the three human airway regions (head airway, tracheobronchial and pulmonary regions) was higher than that from the heat-not-burn product and conventional cigarette; the particle number concentration deposited in the pulmonary region was the highest, comprising more than 60% of total deposition. Lastly, among the lung lobes, the highest number deposition fraction occurred in the right lower lobe. The relationship between deposition fraction and airway generation was relatively similar among the three aerosols, and the highest deposition fraction occurred in the 20th to 23rd generation airways. The deposition results showed that smaller particles, such as those from the e-cigarette aerosol, were more easily deposited in the human respiratory tract. Combined with knowledge of the harmful aerosol constituents, these deposition data will provide important information for hazard evaluation of new tobacco products.


Keywords: Conventional cigarette, e-cigarette, Heat-not-burn product, Aerosol property, Respiratory tract, MPPD-modeled deposition




Don't forget to share this article 

 

Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal, promotes submissions of high-quality research, and strives to be one of the leading aerosol and air quality open-access journals in the world.