by the European Lung Foundation, which says hard-metal pneumoconiosis — a rare lung disease that results from inhaling hard metal particles — has been identified in a person who used vaping devices.
https://www.slashgear.com/vaping-may-cause-lung-scarring-commonly-found-in-metal-workers-04602318/
https://www.slashgear.com/vaping-may-cause-lung-scarring-commonly-found-in-metal-workers-04602318/