Anyone know anything about the lungs and how obesity can cause asthma?

Lots of research: There is a lot of research going on about this topic actually. One of the things that is very common is that as abdominal and chest girth become more of an issue, stomach contents can get pushed up into the esophagus and cause reflux. That reflux material and gas can actually wash down into the lungs creating bad reaction and asthma attack.