1. The socioeconomic gradient of secondhand smoke exposure in children: evidence from 26 low-income and middle-income countries
2. Office on Smoking and Health (US). The Health Consequences of Involuntary Exposure to Tobacco Smoke: A Report of the Surgeon General. Centers for Disease Control and Prevention (US); 2006. Accessed March 24, 2023. https://www.ncbi.nlm.nih.gov/books/NBK44324/
3. Global trends in the prevalence of secondhand smoke exposure among adolescents aged 12–16 years from 1999 to 2018: an analysis of repeated cross-sectional surveys
4. Ministry of Education, Ministry of Health and Welfare, Korea Centers for Disease Control and Prevention. The statistics on the 17th Korea youth risk behavior survey in 2021. In Korean. Korea Centers for Disease Control and Prevention; 2022.
5. International Tobacco Control Policy Evaluation Project. Smoke-free Policies: ITC Cross-Country Comparison Report. University of Waterloo; 2012. Accessed March 24, 2023. https://itcproject.s3.amazonaws.com/uploads/documents/ITC_CrossCountry-Smoke-free_Final-web.pdf