Effects of Tobacco Versus Electronic Cigarette Usage on Nonsuicidal Self-Injury and Suicidality Among Chinese Youth: Cross-Sectional Self-Report Survey Study

Yinzhe Wang   ^{1, 2 *} , MPhil, MSc ;   Shicun Xu   ^{3, 4 *} , PhD ;   Xiaoqian Zhang   ^{5 *} , MD ;   Yanwen Zhang   ^{1 *} , MSc ;   Yi Feng   ^{6, 7} , PhD ;   Yuanyuan Wang   ⁸ , PhD ;   Runsen Chen   ^{1, 9} , PhD

¹ Department of Human Development & Quantitative Methods, Graduate School of Education, University of Pennsylvania, Philadelphia, PA, United States

² Vanke School of Public Health, Tsinghua University, Beijing, China

³ Northeast Asian Research Center, Jilin University, Changchun, Jilin, China

⁴ China Center for Aging Studies and Social-Economic Development, Jilin University, Changchun, Jilin, China

⁵ Department of Psychiatry, Tsinghua University Yuquan Hospital, Beijing, China

⁶ Mental Health Center, Central University of Finance and Economics, Beijing, China

⁷ Psychology Application Center for Enterprise and Society, School of Sociology and Psychology, Central University of Finance and Economics, Beijing, China

⁸ Key Laboratory of Brain, Cognition and Education Sciences, Ministry of Education, Beijing, China

⁹ Institute for Healthy China, Tsinghua University, Beijing, China

*these authors contributed equally