So I quit smoking cold turkey almost 8 months ago...?

I, too, coughed a lot when I quit (briefly--say, 6 weeks). I was up nights hacking and, in the end, took cigarettes to repress the coughing! Of course, I'm sorry I did, and now I think I'll try quitting again when I'm on unpaid break from my job & can afford to be hacking for a long period. My coughing was not as bad as yours--and I've smoked mostly Marlboro reds for 40+ years & have had pneumonia twice (& every cold & flu turns into bronchitis). You are brave! an inspiration! Presumably the coughing up will subside. Still, maybe someone (a doctor?) knows of something to protect your tissues while you're going through this... I'm sorry, I don't know. But I ume it's better to cough that stuff out than to not cough it out (unless you're coughing up tissue). I could suggest drinking sage tea etc. to help purify but it seems that the chunks of stuff are extreme... Good luck & congratulations!