im a 15 year old girl and have been smoking 2 years i now realize how bad it is, so im going to stop. i have never smoked more than 5 cigarettes a day, for the past month i have been having chest pain EVERY single day.. it hurts, and i run out of breath very fast. i don't cough alot, but sometimes i do. it hurts mostly when i breathe, and some times i get a raging heartbeat.. and it makes my neck, back, and left arm/shoulder hurt. any ideas? please help! SOMETIMES i get a LITTLE relief when i burp. do you think i have lung cancer? it hurts ALL day EVERYDAY!