I'm a 19 year old male and if been having very bad chest pains for about 3+ months. This all started when I was smoking one night and out of nowhere my left breast jut got incredible hot and fet like my heart was goin to pop out my chest. I stopped smoking since that happened and that never happened again but I have pain everyday on the left side of my chest usually under my left breast, under my armpit, on my back top left of my shoulder, and almost to the center of my chest on my left breast. I got my heart checked out I got my lungs checked out everything seems to be fine but that's what they tell me... They said it is my muscles and not to worry but I'm in pain I almost feel like I can do anything I'm not in the mood no more to do anything. I am not over weight I'm 125 pounds, was very energetic, I never really got tired. When I smoke I sometimes feel that hot sensation on the left side of my chest. I've been smoking for about a year or more almost everyday, I quit cigarettes because of this and I used to smoke about 2 packs a day... It was very bad. Please someone let me know if u have felt this before or if U know what I can do to make this go away i have not been myself lately because of this. I have not smoked since I felt it the pain for the first time when I was high and I still feel very bad.