Hi ... I am by no means an expert but your Dad's symptoms don't sound good
I also had a Dad with bad habits and lung problems.
The Scan and the Bronchioscopy are great tests ... that will help alot.
Has he had any Blood work done??
that can tell a tale as well.
I see you are in Canada. I am just curious...how is the system doing with getting swiftly on your with your Dad's case. As I hear it can be a lengthy process at times.
I live in Washington State and often hear of Canadians coming here for faster health care.
I'll be thinking of ya

if you have time keep us posted ~ Teri