Cancer or infections can occur anywhere when your PH level or acidic level is high and lungs because her ancestry / dna lineage comes with weaker lungs ? Might be certain food or habit they accustom to. Certain foods/habits are more taxing or enhance certain organs it need not be smoke/drink.
* Animal protein, wheat, gluten, dairy, refined and processed sugars are all high acidifying foods. Common substances like coffee, tea, alcohol, tobacco are also acidic in nature.