Impact of Smoking on COVID-19 Symptoms in Non-Vaccinated Patients: A Matched Observational Study from Qatar by Haider, Mohammad Z, Al-Mannai, Amna, Al-Sirhan, Sally, Elsabagh, Ahmed, Nasser, Nasser, Al-Quraishi, Noora, Ouda, Amr, Erradi, Khadija, Ashour, Anas A, Gupta, Ishita, Abdulmajeed, Jazeel, Al-Romaihi, Hamad E, Bansal, Devendra, Musa, Omran A H, Abd Farag, Elmoubasher Abu Baker, Al-Thani, Mohammed H J, Al Moustafa, Ala-Eddin

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