I have quit smoking and vaping for about 3 weeks now. I did smoke one cigarette over the weekend and I'm not proud of it. How long is my chest and heart going to hurt for? I have this tightness in my chest and I feel some pain coming from my heart every so often it's not constant but it's concerning to me. Doctor says I'm fine but I'm just waiting for this to pass, it's super uncomfortable and my anxiety about it has been awful.