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Have a metallic taste in mouth and dry cough? A concern? Social smoker.
One of the very common cause of metallic taste and dry cough is gastroesophageal reflux disease (GERD). So that needs to be ruled out. Despite that you are a social smoker, it helps in the problem, if smoking is quit.
Read the resource, which tells you about the detailed causes and what to do for the metallic taste:
Gum, teeth infections, oral cavity inflammation and medications are the other common causes for the metallic taste.
Seems to be not a big concern.
Please feel free to ask follow up questions.