Simons D, Shahab L, Brown J, et al. - This study was attempted to calculate the relationship of smoking status with rates of infection, hospitalization, disease severity, and mortality from SARS-CoV-2/COVID-19 disease. Adults who received a SARS-CoV-2 test or a COVID-19 diagnosis were included in this study. Researchers searched Version 7 up to 25 August 2020 including 233 studies with 32 ‘good’ and ‘fair’ quality studies included in meta-analyses. The results showed that current smokers seem to be at decreased risk of SARS-CoV-2 infection in comparison with never smokers, while former smokers appear to be at increased risk of hospitalization, elevated disease severity, and mortality from COVID-19. Nevertheless, it is uncertain if these relationships are causal.