Can a smoker get healthy lungs?

I'm curious to know, is it actually possible for a smoker to regain healthy lungs? We often hear about the negative impacts smoking has on our respiratory system, but are there any methods or treatments available that can help smokers reverse the damage and restore their lungs to a healthier state? Or is the damage irreversible once it's done? It's a question that many smokers and former smokers may have, so I'm eager to hear your thoughts on this topic.