You’re 82. You’ve lived a longer life than most folks. Don’t be blaming yourself for getting Lung disease when your 82.
He didn’t “just” get lung disease at 82. It just got so bad that it “killed him at 82”. He has probably been struggling to breathe for 10 or 15 years.
I saw it with the WW2 generation in mine and my husbands family. COPD is nothing to sneer at, it destroys their quality of life long before they die from it.