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Impact of Smoking on COVID-19 Symptoms in Non-Vaccinated Pa..:

Haider MZ ; Al-Mannai A ; Al-Sirhan S...
https://www.dovepress.com/impact-of-smoking-on-covid-19-symptoms-in-non-vaccinated-patients-a-ma-peer-reviewed-fulltext-article-JMDH.  , 2022