Nicotine has also been said to help fight the disease. French doctors have been given patches. Some study apparently showing smokers are 80% less likely to develop severe symptoms.

https://www.jpost.com/health-science/smoking-appears-to-prot...

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-ma...