Published on in Vol 9 (2023)
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/40782, first published
.
![Trends in Exposure to Secondhand Smoke Among Adolescents in China From 2013-2014 to 2019: Two Repeated National Cross-sectional Surveys Trends in Exposure to Secondhand Smoke Among Adolescents in China From 2013-2014 to 2019: Two Repeated National Cross-sectional Surveys](https://asset.jmir.pub/assets/90c9452fd284afc91bab594af19638fc.png 480w,https://asset.jmir.pub/assets/90c9452fd284afc91bab594af19638fc.png 960w,https://asset.jmir.pub/assets/90c9452fd284afc91bab594af19638fc.png 1920w,https://asset.jmir.pub/assets/90c9452fd284afc91bab594af19638fc.png 2500w)
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