[entropy12]

We think it was her growing up in a family where everyone smoked, both parents and 4 siblings. Also the family lived in a basement apartment in Chicago where Radon is present.

[Steve Van Doorn]

"We think it was her growing up in a family where everyone smoked, both parents and 4 siblings. Also the family lived in a basement apartment in Chicago where Radon is present."

That doesn't account for why it flared up now. Her immunity was weakened is likely the case.