I am 16 year old male, mostly normal medical history, but recently kicked a 2 year smoking habit that was almost a pack a day at its peak. Since right before I quit, I've been constantly coughing up sputum, that is abnormally dark, no blood though. I also am suffering from areally raspy voice, shortness of breath, and am beginning to have difficulty swallowing, and loss of appetite, which worries me.