Hi, im a 16 year old girl. I have been having chest pains for quite a while now. I am also a heavy smoker and have been smoking since i was 13. I dont know if that could be a factor, since the pains feel like they are more in my lungs. as when i take deep breaths when i swim, or walk up stairs is when i feel it most. But sometimes. i could just be sitting down and and the pains will occur. Please help?