[1] World Health Organization. WHO report on the global tobacco epidemic 2021: addressing new and emerging products. License: CC BY-NC-SA 3.0 IGO. https://www.who.int/publications/i/item/9789240032095. [2021-7-1].https://www.who.int/publications/i/item/9789240032095
[2] Gao GF, Li XH. 2019 GYTS county report China. Beijing: People’s Medical Publishing House, 2022. (In Chinese). 
[3] State Administration of Market Supervision, State Tobacco Monopoly Administration. Notice on prohibiting the sale of electronic cigarette to minors. (2018-8-28)[2022-6-11]. http://www.gov.cn/gongbao/content/2020/content_5488930.htm. (In Chinese). http://www.gov.cn/gongbao/content/2020/content_5488930.htm
[4] State Administration of Market Supervision, State Tobacco Monopoly Administration. Notice on further protection of minors from E-cigarettes. (2019-10-30)[2022-6-11]. http://www.gov.cn/xinwen/2019-11/01/content_5447612.htm. (In Chinese). http://www.gov.cn/xinwen/2019-11/01/content_5447612.htm
[5] Leventhal AM, Miech R, Barrington-Trimis J, Johnston LD, O’Malley PM, Patrick ME. Flavors of e-cigarettes used by youths in the United States. JAMA 2019;322(21):2132 − 4. http://dx.doi.org/10.1001/jama.2019.17968CrossRef
[6] Cullen KA, Gentzke AS, Sawdey MD, Chang JT, Anic GM, Wang TW, et al. E-cigarette use among youth in the United States, 2019. JAMA 2019;322(21):2095 − 103. http://dx.doi.org/10.1001/jama.2019.18387CrossRef
[7] Bold KW, Kong G, Cavallo DA, Camenga DR, Krishnan-Sarin S. Reasons for trying E-cigarettes and risk of continued use. Pediatrics 2016;138(3):e20160895. http://dx.doi.org/10.1542/peds.2016-0895CrossRef
[8] Xiao L, Yin X, Di XB, Nan Y, Lyu TC, Wu YQ, et al. Awareness and prevalence of e-cigarette use among Chinese adults: policy implications. Tob Control 2022;31(4):498 − 504. http://dx.doi.org/10.1136/tobaccocontrol-2020-056114CrossRef
[9] Hanewinkel R, Isensee B. Risk factors for e-cigarette, conventional cigarette, and dual use in German adolescents: a cohort study. Prev Med 2015;74:59 − 62. http://dx.doi.org/10.1016/j.ypmed.2015.03.006CrossRef
[10] Ling MYJ, Ahmad N, Yusoff MFM, Lim KH. Current e-cigarette use among in-school adolescents in West Malaysia: examining the interactions between sociodemographic characteristics and lifestyle risk behaviours. PLoS One 2022;17(1):e0263355. http://dx.doi.org/10.1371/journal.pone.0263355CrossRef