It actually says more like "smoking damages 95%+ of your lungs [1], but more than half of that damage can be undone if you quit". I think that's pretty impressi

It actually says more like "smoking damages 95%+ of your lungs [1], but more than half of that damage can be undone if you quit". I think that's pretty impressive, even if there's still a lot of lasting damage. [1] "The overwhelming majority of cells taken from a smoker's airways had been mutated by tobacco, with cells containing up to 10,000 genetic alterations."