He didn't quite say that smoking doesn't damage your lungs, he said that quitting doesn't improve your lifespan. For example he wrote that other forms of cance

He didn't quite say that smoking doesn't damage your lungs, he said that quitting doesn't improve your lifespan. For example he wrote that other forms of cancer apparently are more common among quitters. Of course there are lots of plausible explanations for that, among them that ceasing use of a stimulant causes increased obesity which from what I understand increases risk of many cancers. Actually I read that really quickly. I hope I'm not completely wrong about what he said.