Cigarette smoke can cause staining via the same principle as ghosting. The soot attaches to cold spots on the ceiling. In this case, it was due to areas of missing insulation in the attic. Cleaning soot from ghosting is extremely hard. Typically your only recourse is to repaint....
This pollution is planetwide, impossible to fully remediate, and threatens to disrupt natural systems — including those that allow the oceans to remove carbon from the atmosphere. “Humans are conducting a singular uncontrolled experiment on a global scale,” write the researchers inScience Advance...