Hello. Welcome to hcm.
causes lot of problems and cancer. Quitting now is a good option. Nobody can say you wil not have any problems for smoking you have done,but if you quit now,you can expect a normal life span as of others.
Getting pain in chest and abdomen is just that you are not accustomed for running.
I advice you to stop smoking and start exercising. Monitor your bmi and eat healthy foods. If pain is too severe,you have to undergo tests to rule out any pathology.
All the best