I only really notice it when I am sitting very still. I am 29 and I do realize that I am young but smoking affects everyone at every age. I have been smoking since I was 13. at that age it was just a couple a week. at 16 it was 5 or 10 a day. from 17 on it was a pack a day. so for 12 years I was a pack a day smoker. I always said that I wanted to quit before I was 30. So I made my stupid deadline big deal. The health affects of smoking are not reversible. Should I go get a lung x ray? I keep reading stories of people who were young that found a lump or a bump and thought nothing of it and it ended up fatal for them. I wish I would have never smoked. I m sure we all feel that way. Do your lungs actuallly repair them selves?