1.Sančanin B, Penjišević A. Impacts of tobacco use and exposure to tobacco smoke on health, society, economy, and environment MEDIS–International Journal of Medical Sciences and Research. 2024;3(2):25-9.
2.Jackson SE, Brown J, Shahab L, Steptoe A, Fancourt D. COVID-19, smoking and inequalities: a study of 53 002 adults in the UK. Tob Control. 2021;30(e2):e111-e21.
3.Hopkinson NS, Rossi N, El-Sayed_Moustafa J, Laverty AA, Quint JK, Freidin M, et al. Current smoking and COVID-19 risk: results from a population symptom app in over 2.4 million people. Thorax. 2021;76(7):714-22.
4.Farsalinos K, Barbouni A, Poulas K, Polosa R, Caponnetto P, Niaura R. Current smoking, former smoking, and adverse outcome among hospitalized COVID-19 patients: a systematic review and meta-analysis. Ther Adv Chronic Dis. 2020;11:2040622320935765.
5.Chenchula S, Vidyasagar K, Pathan S, Sharma S, Chavan MR, Bhagavathula AS, et al. Global prevalence and effect of comorbidities and smoking status on severity and mortality of COVID-19 in association with age and gender: a systematic review, meta-analysis and meta-regression. Sci rep. 2023;13(1):6415.
6.Fatmawati F, Mulyanti S. Risk factors associated with the severity of COVID-19. The Malays J Med sci: MJMS. 2023;30(3):84.
7.Chattopadhyay S, Malayil L, Kaukab S, Merenstein Z, Sapkota AR. The predisposition of smokers to COVID-19 infection: A mini-review of global perspectives. Heliyon. 2023.
8.Neira DP, Watts A, Seashore J, Polychronopoulou E, Kuo Y-F, Sharma G. Smoking and risk of COVID-19 hospitalization. Respir Med. 2021;182:106414.
9.Lippi G, Henry BM. Active smoking is not associated with severity of coronavirus disease 2019 (COVID-19). Eur J Inter Med. 2020;758:107-8.
10.Patanavanich R, Siripoon T, Amponnavarat S, Glantz SA. Active smokers are at higher risk of COVID-19 death: a systematic review and meta-analysis. Nicotine Tob Res. 2023;25(2):177-84.
11.Durmuş V. Is the country-level income an important factor to consider for COVID-19 control? An analysis of selected 100 countries. Int J Health Gov. 2021;26(2):100-13.
12.Phannajit J, Takkavatakarn K, Katavetin P, Asawavichienjinda T, Tungsanga K, Praditpornsilpa K, et al. Factors associated with the incidence and mortality of coronavirus disease 2019 (COVID-19) after 126-million cases: a meta-analysis. J Epidemiol Glob Health. 2021;11(3):289.
13.development-indicators/stories/the-classification-of-countries-by-income.html hdwow.
14.Morgenstern H. Ecologic studies in epidemiology: concepts, principles, and methods. Annu rev public health. 1995;16(1):61-81.
15.Tsampasian V, Elghazaly H, Chattopadhyay R, Debski M, Naing TKP, Garg P, et al. Risk factors associated with post− COVID-19 condition: a systematic review and meta-analysis. JAMA intern Med. 2023;183(6):566-80.
16.Casetta B, Videla AJ, Bardach A, Morello P, Soto N, Lee K, et al. Association Between Cigarette Smoking Prevalence and Income Level: A Systematic Review and Meta-Analysis. Nicotine Tob Res. 2017;19(12):1401-7.
17.Yang H, Ma C, Zhao M, Xi B. Prevalence of and Factors Associated With Tobacco Dependence Among Adolescents Aged 12–16 Years Who Were Currently Smoking Tobacco in 125 Countries or Territories, 2012–2019. Am J Public Health. 2023;113(8):861-9.
18.Hong S, Son Y, Lee H, Kim S, Kim HJ, Jo H, et al. Global association of secondhand smoke exposure locations and smoking behaviour among adolescents in 99 countries. Acta Paediatr. 2024;113(9):2048-60.
19.Chen N, Zhou M, Dong X, Qu J, Gong F, Han Y, et al. Epidemiological and clinical characteristics of 99 cases of 2019 novel coronavirus pneumonia in Wuhan, China: a descriptive study. lancet. 2020;395(10223):507-13.
20.Smith JC, Sausville EL, Girish V, Yuan ML, Vasudevan A, John KM, et al. Cigarette smoke exposure and inflammatory signaling increase the expression of the SARS-CoV-2 receptor ACE2 in the respiratory tract. Dev Cell. 2020;53(5):514-29. e3.
21.Zhang J-j, Dong X, Cao Y-y, Yuan Y-d, Yang Y-b, Yan Y-q, et al. Clinical characteristics of 140 patients infected with SARS‐CoV‐2 in Wuhan, China. Allergy. 2020;75(7):1730-41.
22.Park SH, Hong SH, Kim K, Lee SW, Yon DK, Jung SJ, et al. Nonpharmaceutical interventions reduce the incidence and mortality of COVID‐19: A study based on the survey from the International COVID‐19 Research Network (ICRN). J Med virol. 2023;95(2):e28354.
23.Mirahmadizadeh A, Ghelichi-Ghojogh M, Vali M, Jokari K, Ghaem H, Hemmati A, et al. Correlation between human development index and its components with COVID-19 indices: a global level ecologic study. BMC Public Health. 2022;22(1):1549.
24.Borjas GJ. Demographic determinants of testing incidence and COVID-19 infections in New York City neighborhoods. NBER Work Pap Ser; 2020.
25.Asem N, Ramadan A, Hassany M, Ghazy RM, Abdallah M, Ibrahim M, et al. Pattern and determinants of COVID-19 infection and mortality across countries: an ecological study. Heliyon. 2021;7(7):e07504.
26.Carozzi F, Provenzano S, Roth S. Urban density and COVID-19: understanding the US experience. Ann Reg sci. 2024;72(1):163-94.
27.Hodgins S, Saad A. Will the higher-income country blueprint for COVID-19 work in low-and lower middle-income countries? : Glob Health Sci Pract; 2020. p. 136-43.
28.Whittle RS, Diaz-Artiles A. An ecological study of socioeconomic predictors in detection of COVID-19 cases across neighborhoods in New York City. BMC Med. 2020;18(1):1-17.
29.Cho ER, Jha P, Slutsky AS. Smoking and the risk of COVID-19 infection in the UK Biobank Prospective Study. medRxiv. 2020.
30.Hassan MM, Kalam M, Shano S, Nayem M, Khan R, Rahman M, et al. Assessment of epidemiological determinants of COVID-19 pandemic related to social and economic factors globally. J Risk Financ Manag. 2020;13(9):194.
31.Ritchie H, Ortiz-Ospina E, Beltekian D, Mathieu E, Hasell J, Macdonald B, et al. Coronavirus pandemic (COVID-19). Our world in data. 2020.
32.Israel A, Feldhamer I, Lahad A, Levin-Zamir D, Lavie G. Smoking and the risk of COVID-19 in a large observational population study. Medrxiv. 2020:2020-06.
33.Patanavanich R, Glantz SA. Smoking is associated with COVID-19 progression: a meta-analysis. Nicotine Tob Res. 2020;22(9):1653-6.
34.Said KB, Alsolami A, Alreshidi FS, Fathuddin A, Alshammari F, Alrashid F, et al. Profiles of independent-comorbidity groups in senior COVID-19 patients reveal low fatality associated with standard care and low-dose hydroxychloroquine over antivirals. J multidiscip healthc. 2023:1215-29.
35.Sorci G, Faivre B, Morand S. Explaining among-country variation in COVID-19 case fatality rate. Sci Rep. 2020;10(1):1-11.
36.Taylor SA, Mickel AE. Simpson's paradox: A data set and discrimination case study exercise. J Stat Educ. 2014;22(1).
37.Goh HP, Mahari WI, Ahad NI, Chaw LL, Kifli N, Goh BH, et al. Risk factors affecting COVID-19 case fatality rate: A quantitative analysis of top 50 affected countries. MedRxiv. 2020;2020:2020.05.