My mate quit mid jan, last week he started coughing up blood. He went to hospital on thursday, in overnight for observation, xrays and blood tests on friday. Sent home and having to go back on wednesday due to them finding a shadow at the bottom of his right lung, could be a number of things. Its amazing what effect that has had on his mates that do smoke, 8 out of 10 have stopped. He is 29 and was quite a heavy smoker but also pretty fit, does a lot of biking and running. He took Champex tablets to help him stop.