Chest pain or spasm. Cancerous or tb?

I have been an ON and OFF smoker. not a regular though. since december i have quit smoking. My smoke intake was 3-4 ciggarretes per week. I have been experiencing a pain in my chest. but cant figure it out if its a muscle contraction or lung pain. for eg during certain body movements i experience this kind of pain. Sometimes while coughing it pains in the lowest part of lungs or chest. while pressing at the centre of the lung at the upper part there is slight pain. However i go to gym. surprisingly while doing chest workouts or any other i never experience pain in my lungs or chest. recently have observed that i catch cough very quiclky and it last for lot of time.. kindly help me resolve this.. there are frequent short/ single cough in between too. i fear it doesnt get cancerous or TB