Thanks to this group a lot of what I'm experiencing makes sense. I just quit smoking march 26 due to chest pain and an ER visit, that day I had my last cig. Then I experienced shortness of breath and fatigue which triggered a panic attack cause I didn't understand what I was dealing with back to the ER. All the xrays showed clear lungs and normal heart but I still had tightness in my left chest and breathing was restrictedand when telling the docs I recently quit none of them associated it to quitting smoking. So I was left feeling very alone, lost and thought I was going to have a massive heart attack at any moment and they didn't care. I went to have a stress test which I ran 11min and got my heart rate up over 190bpm so I figured if I was going to have a heart attack that would have done it (still waiting on results), so then I said must be lungs and from reading your post it it's very similar to what I'm experiencing although my lungs/chest also seem to get warm at times. I smoked menthols and I'm thinking that it's to blame. Anybody have chest warming at times?