Lung cancer..
Not trying to be a downer but that is probably top 10 worst ways to go..
my condolences sir.. but I am glad this person has a friend like you that cares enough to be there for him.
Thats Gods work you are doing, in maybe the most direct way possible.
Take (God) to mean what it will to you.
I hope you and your friend both find peace.
Love and Respect, sir.
Love and Respect.