1. Smoking history is an important risk factor for severe COVID-19;Gorini;Blog Tob Control,2020
2. COVID-19 and smoking: a systematic review of the evidence;Vardavas;Tob Induc Dis,2020
3. Tobacco smoking and COVID-19 pandemic: old and new issues. A summary of the evidence from the scientific literature;Cattaruzza;Acta Biomed,2020
4. Simons D, Perski O, Brown J. Covid-19: the role of smoking cessation during respiratory virus epidemics. March 20, 2020. Available online at: https://blogs.bmj.com/bmj/2020/03/20/covid-19-the-role-of-smoking-cessation-during-respiratory-virus-epidemics/ (last access: 20 March 2020).
5. Active smoking is not associated with severity of coronavirus disease 2019 (COVID-19);Lippi;Eur J Intern Med,2020