The glass uses a special technology that is normally opaque and cuts off the power in a few seconds after it detects smoke, making the glass transparent.
The shopping centres ensure that bathroom users are aware of the function with a notice on the door that says: “The glass will turn transparent if you smoke. Hold your urge to smoke if you do not want to become famous online.”
1: I am not a fan of it requiring power to be opaque. Lights flicker and suddenly we're all pooping with friends.
2: the power of shame is amazing
