More than two million people in Texas have at some point been diagnosed with asthma. And for some of them, inhalers and medications aren’t enough to stay out of the hospital. In 2010, the FDA approved the first non-medical treatment for severe asthma that involves inserting a heated metal device into the lung to make breathing easier. About 1,000 people across the country – and dozens in Dallas – have had the procedure. Now it’s time to review.