Funny you made this thread, I've had the same exact problem for the last two weeks or so. I'm trying to run everyday (although it's more like a couple times a week) and it helps a lot. I guess any type of cardio would be beneficial since it's making your heart work harder. I'm also taking a break from smoking this week so my chest pains are almost completely gone. You should be fine, just try exercising, and perhaps smoking less frequently. But if it's really that bothersome, see a doctor.