Consider using NAC. The FDA, true to its purpose of controlling citizen access to healthy supplements etc, wants to ban this safe and long-used supplement, but it's still available in some places, including at Life Extension (I have no connection to them other than as long-time a customer).
As is typical with most over-the-counter supplements, "side effects" are generally "better overall health" instead of something horrible like liver damage and whatnot -- still, see here for negative side effects. CAVEAT: You can hurt yourself with way too much of anything, so there's always that. Also, I'm not a doctor; this is just some text on the internet, so do your own research.
Consider using NAC. The FDA, true to its purpose of controlling citizen access to healthy supplements etc, wants to ban this safe and long-used supplement, but it's still available in some places, including at Life Extension (I have no connection to them other than as long-time a customer).
https://www.lifeextension.com/protocols#respiratory
https://www.lifeextension.com/vitamins-supplements/item01534/n-acetyl-l-cysteine
https://www.lifeextension.com/magazine/2020/ss/protect-your-respiratory-system
https://duckduckgo.com/?q=N-Acetyl-L-Cysteine+%2B+lungs
As is typical with most over-the-counter supplements, "side effects" are generally "better overall health" instead of something horrible like liver damage and whatnot -- still, see here for negative side effects. CAVEAT: You can hurt yourself with way too much of anything, so there's always that. Also, I'm not a doctor; this is just some text on the internet, so do your own research.