Hi, Im 24 y/o and i smoke 7 times a day for 6 years. 2 weeks ago i started feeling chest pain and cant breath well. i also had palpitations a few times. I had chest xray, 2-d echo, ecg and stress test and the results were all negative. according to my doc everything is normal but he also asked me to to a pulmunary function test, no result yet as of this time. I tried to smoke again like 3 times a day, there are times that i feel normal although some times after i smoke my right chest/lung feels heavy and a bit painful. Please advise. Thanks!