Estimating the association between cigarette and e-cigarette use patterns and SARS-CoV-2 negative conversion time: retrospective online survey in China by Ying Xie, Yinghua Li, Zheng Su, Xueyan Han, Zhao Liu, Zhenxiao Huang, Anqi Cheng, Xinmei Zhou, Jinxuan Li, Rui Qin, Xiaowen Wei, Yi Liu, Xin Xia, Qingqing Song, Liang Zhao, Kian Fan Chung, Dan Xiao, Chen Wang

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