I have had mucus in my lungs since I quit methadone. I went to the doctor and even had x-rays of my chest. There's no reason, according to the doctor, that my lungs are filling with mucus. He said it's likely an over-reaction of my immune system. I did have respiratory arrest and chronic breathing issues while using methadone. I used an inhaler for a couple weeks and my lungs cleared up, but once the inhaler was gone, my issues continue. Any suggestions on what I could do to strengthen my lungs? Has anyone heard of these symptoms being caused by methadone after 7 months clean time?