Search-engine slush-pile question. “How can you stop COPD when you’ve never smoked?”
Bottom line – whether you’ve smoked or not, COPD cannot be “stopped”.
It can be managed, though – see this post https://ronsrants.wordpress.com/2009/07/31/all-my-copd-and-flu-posts-in-one-place/ for links to my main COPD articles, and type COPD into the search box (top right), to bring up a whole lot more.
That, by the way, doesn’t mean that, somewhere out there, someone isn’t offering a “cure” for COPD, but they’d be lying.