Hello and welcome to Healthcare Magic. Thanks for your query.
Your symptoms such as
cough, breathing difficulty (especially on exertion) and
chest pain could be indicative of a respiratory or a cardiac problem. They are not specific symptoms of
lung cancer, but definitely warrant urgent medical attention.
I would advise you to have a detailed evaluation by a doctor, including certain tests like a chest X-ray and ECG, in order to determine the cause of your problems. It is also obvious that your heavy
smoking seems to be the primary cause of these problems, and so, stopping smoking would be the only option.
Wish you all the best.
Regards,
Dr. Jonas Sundarakumar
Consultant Psychiatrist