- This is the first study of e-cigarette exposure at home under real-use conditions.
- Airborne nicotine in homes with smokers were 5.7 times higher than in e-cig homes.
- Cotinine of non-smokers exposed to e-cig and conventional cigarettes was similar.
- Airborne nicotine in homes with e-cig users was higher than control homes.
- Cotinine of non-smokers exposed to e-cig users was higher than in those no exposed.
Published: 27 September 2014
Link to publication: http://www.sciencedirect.com/science/article/pii/S0013935114003089
Dr Farsalinos comment on the study: http://www.ecigarette-research.com/web/index.php/2013-04-07-09-50-07/2014/184-passive-vape
Jose M. Martínez-Sánchez
José A. Pascual
There is scarce evidence about passive exposure to the vapour released or exhaled from electronic cigarettes (e-cigarettes) under real conditions. The aim of this study is to characterise passive exposure to nicotine from e-cigarettes׳ vapour and conventional cigarettes׳ smoke at home among non-smokers under real-use conditions.
We conducted an observational study with 54 non-smoker volunteers from different homes: 25 living at home with conventional smokers, 5 living with nicotine e-cigarette users, and 24 from control homes (not using conventional cigarettes neither e-cigarettes). We measured airborne nicotine at home and biomarkers (cotinine in saliva and urine). We calculated geometric mean (GM) and geometric standard deviations (GSD). We also performed ANOVA and Student׳s t tests for the log-transformed data. We used Bonferroni-corrected t-tests to control the family error rate for multiple comparisons at 5%.
The GMs of airborne nicotine were 0.74 μg/m3 (GSD=4.05) in the smokers’ homes, 0.13 μg/m3 (GSD=2.4) in the e-cigarettes users’ homes, and 0.02 μg/m3 (GSD=3.51) in the control homes. The GMs of salivary cotinine were 0.38 ng/ml (GSD=2.34) in the smokers’ homes, 0.19 ng/ml (GSD=2.17) in the e-cigarettes users’ homes, and 0.07 ng/ml (GSD=1.79) in the control homes. Salivary cotinine concentrations of the non-smokers exposed to e-cigarette׳s vapour at home (all exposed ≥2 h/day) were statistically significant different that those found in non-smokers exposed to second-hand smoke ≥2 h/day and in non-smokers from control homes.
The airborne markers were statistically higher in conventional cigarette homes than in e-cigarettes homes (5.7 times higher). However, concentrations of both biomarkers among non-smokers exposed to conventional cigarettes and e-cigarettes’ vapour were statistically similar (only 2 and 1.4 times higher, respectively). The levels of airborne nicotine and cotinine concentrations in the homes with e-cigarette users were higher than control homes (differences statistically significant). Our results show that non-smokers passively exposed to e-cigarettes absorb nicotine.
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