Chronic, persistent cough: any advice?

What could a persistent, heavy dry cough (lasting over 8 years) in a smoker actually indicate?
It started off pretty sporadically—not every single day—but now it’s become a constant daily struggle. It hits hardest during the afternoon and evening hours. Lately, it’s gotten so intense that when a coughing fit takes over, it honestly feels like they might suffocate.
The person is 39 years old, but they are dead set against seeing a doctor, no matter what.

They smoke about a pack a day.

I find myself quite at a loss for words, really. He’s constantly struggling through these hacking, smoker's coughs, yet he remains stubbornly opposed to seeing a doctor and refuses to even consider cutting back on the cigarettes. Does he truly not grasp that this path leads to only one inevitable conclusion?
It is incredibly foolish and, frankly, completely irresponsible.

Don't even try to play dumb with me... I already know everything...
It’s just pure selfishness—people who only care about their own immediate interests...
Personally, I wouldn't even authorize treatment for someone like that... No one can honestly tell me they weren't aware of what was happening...

Ugh, I’ve got one of those types living under my roof right now—thank God they aren't coughing yet. But man, they smoke like a chimney and still refuse to see a doctor.

I don't really have any sage advice for you, honestly... I just totally get it.🙂

And look, if they're driving you nuts? Just kick them out. If you actually care about them, fine. If not, just tune them out.😘

There is absolutely no sense in turning a blind eye to this situation. You need to get him to a physician immediately. Just because he’s symptomatic doesn't mean we're facing the absolute worst-case scenario that everyone seems so terrified of. It isn't as if every single cough is an automatic diagnosis of lung cancer, though one cannot deny that those decades spent with a cigarette in hand have clearly taken their toll; perhaps there is still a window of opportunity to mitigate the damage if he simply quits smoking now.

Bite the bullet and see a doctor!

I don't actually like him at all... but since he’s a member of our family (unfortunately), I just feel bad for his parents. They’re constantly worrying about him, yet this idiot refuses to lift a finger for himself, for us, or for them...