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You need to consult an ENT surgeon. Throat pain could be due to pharyngitis
or problem in the vocal cords.
An ENT surgeon will have to examine the throat and vocal cords to see if there is any problem.Smoking
can cause serious problems in these regions as well as in the lungs and airways leading to the lungs. Since you are asthmatic also, the chances of having serious problem is extremely high, so do not ignore these symptoms and consult a doctor immediately.