I'm dealing with this constant tightness in my chest, and I've got some really stressful breathing. Sometimes I even get this sharp, localized pain, but it's weird because it doesn't always hit the same spot. It's been over a year now. The pain comes and goes, but the tightness and breathing issues just aren't letting up. I smoke a lot, and I know that's probably a big part of the problem. But until I figure out how to quit, do you have any medical advice that might help?