Orange i think i know what your problem is. and ive had it myself its "Pluritic Pain" caused by smoking. the lungs are like a sponge in a baggie thats in another baggie. this second sac is filled with fluid normally and when u get pluritic pain caused by many things mainly smoking but also lupus, cancer, unknown causes, as well as misc things. the dryness causes the lungs to rub when you breathe in which is like sandpaper grinding together and it hurts to breathe in deeply. your best bet is take 600mg ibprofen every 4-6 hours as needed until the pain is gone just take 3x 200mg pills if u dont feel like going to the doctors, i aint a doctor so if it persists for longer then say 2-3 weeks taking ibprofen then go to the hospital and have it checked. Wish you the best of luck. Toker