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Electronic cigarettes: age-specific generation-resolved pulmonary doses
Maurizio Manigrasso1, Giorgio Buonanno2,3, Fernanda Carmen Fuoco2
1DIT, INAIL Settore Ricerca, Certificazione e Verifica, via R. Ferruzzi 38/40, 00133, Rome, Italy.
Summary
E-cigarette aerosol exposure is higher than conventional cigarettes, with younger users experiencing greater particle doses. These findings highlight potential risks associated with adolescent e-cigarette use.
Area of Science:
- Environmental Health Sciences
- Toxicology
- Pulmonary Medicine
Background:
- E-cigarette aerosol characteristics and their deposition in the respiratory tract are not fully understood.
- Dosimetry estimates are crucial for assessing potential health risks, especially in vulnerable populations like adolescents.
- Comparison between e-cigarettes and conventional cigarettes is needed to understand relative exposure levels.
Purpose of the Study:
- To compare particle size-number distributions of aerosol from e-cigarettes and conventional cigarettes.
- To estimate age-specific dosimetry for adolescents (9-21 years) using the Multiple-Path Particle Deposition (MMPD) model.
- To evaluate the deposition of e-cigarette aerosol in different regions of the respiratory tract.
Main Methods:
- Particle size-number distributions were measured for e-cigarettes (0 and 14 mg/mL nicotine) and conventional cigarettes.
- The MMPD model was applied to estimate age-specific total number doses (D_Tot) after a 2-second puff.
- Deposition densities and daily liquid deposition volumes per unit surface area were calculated for various age groups.
Main Results:
- E-cigarette aerosol total number doses (D_Tot) were approximately double those of conventional cigarettes.
- Highest D_Tot were observed in 9-year-olds, representing a significant percentage of daily doses in tracheobronchial and alveolar regions.
- Deposition densities were highest in lobar bronchi, with the greatest deposition per unit surface area in younger age groups (9 years) and the lowest in older groups (21 years).
Conclusions:
- Adolescents, particularly younger ones, may receive higher doses of e-cigarette aerosol compared to older individuals and conventional cigarette users.
- The findings suggest a potentially greater risk of respiratory exposure from e-cigarettes in younger populations.
- Further research is warranted to understand the long-term health implications of these exposure levels.