I quit smoking just over two months ago (still want one, but tolerable) and my breathing has gotten more troubled. I'm wheezing and have phlegm in my throat. I haven't been diagnosed with COPD, but I'm not going to pretend it isnt there. I've joined a gym and try to make it at least 30 minutes of cardio per day, but still get out of breath just walking across the room. any suggestions?