1. Cascella M, Rajnik M, Cuomo A, Dulebohn SC, Di Napoli R Features, Evaluation and Treatment Coronavirus (COVID-19). StatPearls Publishing; 2020. Available from: http://www.ncbi.nlm.nih.gov/pubmed/32150360. Accessed April 11, 2021.
2. The association of smoking status with SARS-CoV-2 infection, hospitalisation and mortality from COVID-19: A living rapid evidence review (version 6)
3. World No Tobacco Day. Available from: https://www.who.int/campaigns/world-no-tobacco-day. Accessed April 26, 2021.
4. World Health Organization. WHO statement: tobacco use and COVID-19. World Health Organization; 2020. Available from: https://www.who.int/news/item/11-05-2020-who-statement-tobacco-use-and-covid-19. Accessed June 29, 2021.
5. Centers for Disease Control and Prevention (CDC). People at Increased Risk of Covid-19; Published online 2020. 2019–2021. Available from: https://www.cdc.gov/coronavirus/2019-ncov/need-extra-precautions/index.html. Accessed June 29, 2021.