It is wonderful you are off your drug, you are to be admired! As to the coughing up??? Do you smoke???? It could be related to smoking. If so, I suggest you see a doctor.
Good Luck....CAN
Congratulations on stopping meth. I had a friend who was addicted and I know how hard it can be to quit. I don't know for sure, and I am not asking, so you don't have to answer, but if you were smoking it and quit, it could just be your lungs clearing themselves. I have no idea though, so if you're really concerned you should see a doctor.