Quitting smoking, has anybody experienced this side effect?

I wasn't really a full time smoker, I smoked every time I was drinking, I dunno that's just when I got my cravings but I started getting cravings when I was sober so I decided to quit. I quit smoking in February but recently I have been getting phlegm and a really bad smell coming from the back of my throat, is this related to smoking, is my lungs clearing out or something? How do I get the smell away because I tried mouthwash , I brush my teeth twice a day using mouthwash both times, nothing seems to be working!