Hello. Well, there is something that concerns me for quite some time now. I am 20 year old male, going 21 in December. I've been smoking cigarettes for about 4 years now. Can't really tell you the amount, but it doesn't go over 20-pack a day. I had a persistent cough for months now, including chest pains. First just on the left side, now on both sides. The chest pains are random, sometimes they occur when I inhale or exhale, but it's usually random. Two months ago I've noticed blood in my sputum. There wasn't a lot of it, just a string. Since then I've been seing blood in my sputum every now and then, and like the first time, it's just a few strings of blood. I also get bone pains, usually in my fingers. What is wrong? Is it lung cancer? Is it possible to get lung cancer at that age?