Does quitting marijuana and cigs cause phlegm to buildup in your throat and feel as if something is stuck in the throat. I've been spitting up alot of light phlegm and dark greenish phlegm is their any thing to be concerned over. Have quite 16 days ago after 8 yrs of using on and of but never quite longer than 2 weeks? Also my anxiety is increased because I used marijuana to cope with my anxiety.