At serious risk of becoming an obnoxious anti-smoker

Chronic Obstructive Pulmonary Syndrome (COPD) used to be called emphysema.
Unlike asthma, you can't recover from it, and can't outgrow it. It just gets worse, and can only be treated symptomatically. Nothing will regrow your lungs.
My dad is dying from this, in part because he was a smoker.
Quitting helps right away, but even quitting might not save you - he quit over 30 years ago, and started inhalers about 25 years ago.
Smokers: be warned. I'm likely to give you a hard time if I spot you.
You don't want to be trapped in your own house, attached to an O2 tank, unable to go out, and your family doesn't want to care for you. Trust me.