Hope your Dad recovers as best he can.
They have wonderful advances in lung diseases, like medicines that are tolerated with less side effects than even 10 years ago.
If he doesn't have oxygen yet, he is in a fair to good place with his lung disease.
He can take the medications, meet with his Dr. when told, and stay clear of certain foods, and cigarettes, first and second hand.
He'll be around a longtime Dear Person, so you have lots to look forward to yet with your Dad.
Your a wonderful son ... Bless your heart!
peace and love,
nightbird