Quit smoking three months cough mucus phlegm difficult to come out can use drugs, pat the back, strengthen the movement. 1. Drugs, on the one hand, you can use acetylcysteine effervescent tablets and other drugs to dissolve mucous phlegm, can assist in coughing up mucous phlegm; on the other hand, you can take fresh bamboo lee oral solution and other phlegm drugs, through the drug phlegm. 2. Back patting, for the deep mucous phlegm which is not good to cough out, you can pat your back, make your hand hollow and pat up and down on your back, which can assist to cough out the mucous phlegm. 3. Exercise, such as swimming, jogging, etc., to improve the cardiopulmonary function while breathing more fresh air, thereby enhancing lung capacity, which is conducive to the discharge of phlegm. The choice of specific drugs and treatment programs should be based on medical advice. If the effect is not good, it is recommended to consult a specialist in time for further clarification.