He has the lung disease emphysema and is only in his 20′s.
Answer:
I was going to say that there was no way of knowing since while smoking certainly greatly increases you chances of getting certain diseases it doesn’t necessarily mean you will get them. However, if he already has lung disease in his 20′s and he’s still smoking, I don’t know when he is going to die but it certainly can’t be the most enjoyable way to live.