Quit smoking THC in November, still coughing up gray stuff.

So I’m not an avid weed smoker, I started again last year around March-April and smoked almost every day until November when I started having some weird issues like dizziness/lightheadedness. I was coughing up gray mucus the whole summer before that and eventually quit in November where for the first couple weeks I couldn’t hold down food and was vomiting (I have other health issues which I think the weed was effecting which is the reason I stopped) and I haven’t smoked since then. I’m still coughing up gray mucus occasionally, it’s not every time but it still happens. Anyone have this happen before? When did it stop? I don’t have chest pains when this happens and I don’t believe it smells foul. Just wanna know other people’s experiences, if they saw a doctor, etc.