There is also this study which says smoking in young adult increases the risk of Covid progression - https://www.ucsf.edu/news/2020/07/418081/1-3-young-adults-m

There is also this study which says smoking in young adult increases the risk of Covid progression - https://www.ucsf.edu/news/2020/07/418081/1-3-young-adults-may-face-severe-covid-19-ucsf-study-shows https://www.ucsf.edu/news/2020/07/418081/1-3-young-adults-ma...