Source:
                
                                      Patanavanich, R., & Glantz, S. (2020). Smoking is Associated with COVID-19 Progression: A Meta-Analysis. Nicotine & Tobacco Research. 
                                      Liu, W., Tao, Z., Wang, L., Yuan, M., Liu, K., & Zhou, L. et al. (2020). Analysis of factors associated with disease outcomes in hospitalized patients with 2019 novel coronavirus disease. Chinese Medical Journal, 133(9), 1032-1038. 
                                  
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                          E-cigarettes,                          Disease