Respected Sir, hi I evaluation your query thoroughly. Meth is one of the most dangerous narcotic drugs which substantially harms so many body systems on short and long term basis. Problem of mucus and breathing is regarding it`s pulmonary damage only. But fine still if you have quited it totally and if not going to restart it in future or any other similar ailments. Follow certain definite result giving steps as follows : * Be confident from inside to stay away from any abuses what ever happens in life. * Do regular deep breathing exercises and YOGA for 30-40 minutes daily to regain your lost pulmonary function. * Strictly prohibit yourself from smoking / alcohol consumption if doing. * Take regular sleep of 8 hours. * Keep your BP , Blood Sugar levels under control. * Avoid exposure to excess cold temperature and excess heights . * Do regular early morning walk of 20-30 minutes to get fresh oxygen for your lungs which is vital. * Keep laughing and having inner happiness to boost up your immune system on your own without anybody`s assistance. Hope this clears your doubts and query. Thanks for using Health care Magic and reading my question with patience. Regards Wishing you a fast and speedy recovery from the same. Bye Take care Dear.