The Tobacco and Salt Museum is one of Tokyo's stranger small museums, built around two substances that were once government monopolies in Japan. The displays cover production, trade, tools, packaging, and the way both tobacco and salt entered daily life.
Most exhibits have English translations, and the museum offers English map-guides and a mobile audio tour. It is a good detour if you are already in Sumida or Ryogoku and want something more specific than another general history museum.