<s>[INST] Well, I have been feeling some random chest pains throughout the day. They dont last long, they are just like little shots of pain mostly on the left side. And sometimes I feel like I have to keep breathing very heavily. i have recently started smoking and i believe that may have something to do with it but Im not sure. can you please help me? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Yes, these random chest pains and breathing difficulty are mostly due to smoking habit. So you should quit smoking as soon as possible. If these symptoms do persist even after smoking cessation, you should get done ECG and 2d echo to rule out heart diseases. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>