Hello Doctor, I am a person who smokes around 5 to...

Dear Customer
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What is the possible cause of your medical condition ?
those symptoms are typical for prolonged lung infection that is caused by smoking , which is an expected results 
What to do next :
1. consult an internal medicine doctor to do the needed medical examnation and determine the treatment pathway
2. stop smoking and avoid alcohol and dusty weather
3. drink plenty of water and vitamin C drinks and honey 
4. take antibiotics such as amoxicillin  ( 2 pills /daily ) for one week
5. take medication to relieve cough and phlgem such as ivy syrup
6. intial chest X-RAY may be enough to see if there is major changes in lungs or bronchies 
Needed medical examinations :
1. physical examnation by doctor 
2. blood and blood chemistry tests
3. chest X-ray
4. blood gases tests 
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Kind Regards