What is the chance of getting emphysema if you have not smoked in 30 years?

My grandmother has not smoked in 30 years and was in good health and then all of a sudden she has emphysema! She was also diagnosed with pnemonia as well. Thats how they found the emphysema.
Update: They said it was from smoking but i have been doing research and i want to ask them if she has an alpha-1 antitrypsin deficiency. Why have they not diagnosed her sooner if its so severe?
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