Is this really that surprising, considering that only 2.6%[1] of Asian American women smoke? If 0% of Asian American women smoked, then 100% of the lung cancer cases would come from non-smokers. As it is, the group with the lowest percentage of smokers should have the highest percentage of lung cancer cases in non-smokers.
The article gives no absolute rates to compare, and I can't easily find the article they quote for the rising rates of lung cancer in Asian American women. Given the poor interpretation of the subheading, I wouldn't be surprised if it was entirely explained by aging, or was a reversion to the mean from a very low baseline.
[1] From another comment on this article: https://www.lung.org/quit-smoking/smoking-facts/impact-of-to...