hi there my name is roxanne for the last few months i have suffered with on and off pain in my left what feels like lung! it is a sharp constant pain under my breast towards the outside or even the inside but always on my left handside. i dotn know if its my heart or my lung or may breast.?? it is very painful and irritating. yes i am a smoker but also have been addicted to allot of energy drinks. but this to me feels it is not the cause more maybe my lung or breast ?