There's one way to tell.
Does he want to breath a half hour later?
Study up on the Bene Tleilax for all you need to know about organ transplants and their 'manufactured market'. Then tell me the Tleilaxu aren't here and working at the CDC and WHO.
Have they tried putting fish gills into people instead of lungs? Surely someone has worked on that, since the Chi-com military were equipping mice with humanized lungs.