Trends in Exposure to Secondhand Smoke Among Adolescents in China From 2013-2014 to 2019: Two Repeated National Cross-sectional Surveys

Chuanwei Ma   ^{1 *} , MSc ;   Yayang Huang   ^{2, 3 *} , MD ;   Sixuan Li   ^{4, 5 *} , MPH ;   Min Zhao   ⁶ , MD ;   Xinying Zeng   ⁵ , BSc ;   Xinbo Di   ⁵ , BA ;   Costan G Magnussen   ^{7, 8, 9} , PhD ;   Bo Xi   ¹ , MD ;   Shiwei Liu   ⁵ , PhD

¹ Department of Epidemiology, School of Public Health, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China

² Health Education Institute, Beijing Center for Disease Prevention and Control, Beijing, China

³ Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China

⁴ Department of Chronic and Noncommunicable Disease Control and Prevention, Ningbo Municipal Center for Disease Control and Prevention, Ningbo, China

⁵ Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing, China

⁶ Department of Nutrition and Food Hygiene, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, China

⁷ Baker Heart and Diabetes Institute, Victoria, Australia

⁸ Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku, Finland

⁹ Centre for Population Health Research, University of Turku and Turku University Hospital, Turku, Finland

*these authors contributed equally