Association between exposure to secondhand aerosol from heated tobacco products and respiratory symptoms among current non-smokers in Japan: a cross-sectional study.

6 7 In the USA, middle and high school students have been exposed to secondhand aerosols from e-cigarettes, with an increasing trend (approximately 25% in 2015 and 33.2% in 2018). 7–9 In the TackSHS survey that included nationally representative samples aged 15 years in 12 European countries, 16.0% of respondents experienced secondhand aerosols from e-cigarettes. 6 Secondhand aerosols from HTPs have also been prevalent, especially in Japan, which has the most fertile market for HTPs. 5 In recent studies, associations of secondhand aerosol from e-cigarettes with negative respiratory outcomes were observed.

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