I can only speak from personal experience, and I had renal failure from blood pressure issues. I did about 5 years of dialysis and was working with a great transplant team. I was straight with them about my cannabis use, and that it was integral to my ability to function properly. The head doctor smiled, shook my hand and said, Don't worry about that, you'll be fine, just try not to bring that up in front of my students.
Now, whenever I see any of my doctors, as they check me out, they always comment about how clear my lungs sound!
I gave up booze and tobacco, but nobody's takin' my herb! Good luck.