Various radioactive substances used in everyday objects, and even added to foods.
Uranium- a colourant for glass
Radium- glow in the dark watches, clock faces, marine and aeronautical instruments- oh and added to bread, toothpaste, suppositories...
Thorium- used in gas mantles.
On a less radioactive note- lead carbonate in paint. People knew how dangerous it was because the factory workers kept dying so young.
Arsenic in wallpaper, flypapers, used as a cosmetic, or as a tonic. Or even used as a food colourant causing deaths in Greenock in the 19th century.