Hi and welcome to Healthcare Magic. Thanks for your question...
Shortness of breath
, which becomes worse on exertion may be indicative of a cardiac problem. Smoking
is an important risk factor the same. So, I would advise you to see a doctor and have proper evaluation, including an ECG. Quitting smoking is also going to help a lot in reducing your risk for heart problems.
Wish you all the best.
- Dr. Jonas Sundarakumar