my chest feels like i smoked a pack of cigarettes Pack-years is way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org/lung What happens to your lungs
What happens to your lungs from smoking? UT MD Anderson How to Heal Lungs from Smoking Damage Can Smoking Cause Chest Pain? Know the Health Risks Smoking just two cigarettes daily increases health risks Timeline of Lung Recovery After Quitting Smoking
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