Hi there, Thanks for your query. The possible causes are allergy to smoke/pollutants; or, an inflammation / nodule of the vocal cord(s). Other features of allergy (such as, nasal/throat irritation/itching, watering and burning of eyes, dry cough, sneezing- if present, confirms the diagnosis of upper respiratory allergy. Gargles with saline (4-6 tablespoons of salt in a glass of warm water) will help. Consult an ENT doctor and apprise him of my opinion. I am certain that he will agree with me, examine your throat and vocal cords, and- based on the findings- will prescribe suitable/modified treatment. If you find my response helpful and informative, do not forget an “excellent” (5-star rating) to my answer, to ENCOURAGE ALL doctors- engaged in social service- to render sound advice to the FREE queries. Take care Dr. Rakesh Karanwal