I have 6 cats, and 3 are geriatric. We've been vaping for over 2 years. No problems here with our clowder. I'm sorry to hear about your two felines.
I think the radon testing is a good idea. Our house was tested before we bought it and levels were such that it required a mitigation system.
Also, did they run any blood tests? Those might have revealed something.
Cornell had a very good write up about lung issues in cats. Maybe something there will help or ring a bell.
One other thought. They may have died from different causes, but their symptoms were similar.
I hope you get some answers.
I think the radon testing is a good idea. Our house was tested before we bought it and levels were such that it required a mitigation system.
Also, did they run any blood tests? Those might have revealed something.
Cornell had a very good write up about lung issues in cats. Maybe something there will help or ring a bell.
One other thought. They may have died from different causes, but their symptoms were similar.
I hope you get some answers.