Prevalence of tobacco dependence and associated factors in China: Findings from nationwide China Health Literacy Survey during 2018–19 by Liu, Z, Li, Y-H, Cui, Z-Y, Li, L, Nie, X-Q, Yu, C-D, Shan, G-L, Zhou, X-M, Qin, R, Cheng, A-Q, Chung, KF, Chen, Z-M, Xiao, D, Wang, C