Ammonia was used to create blueprints. In my first job after college I work very close to the blueprint room and one day a rather large & full plastic cylinder of ammonia fell over and fumes were everywhere (like one of those vaping pipes).. Of course, every one got out but some people had respiratory issues. Below is what ammonia fumes can do when inhaled. This sounds serious to me.
Inhalation: Ammonia is irritating and corrosive. Exposure to high concentrations of ammonia in air causes immediate burning of the nose, throat and respiratory tract. This can cause bronchiolar and alveolar edema, and airway destruction resulting in respiratory distress or failure.

FYI, my Father was gassed during WWI during the Meusse -
Argonne campaign. The effects of this did not show up until latter in life. That gas was very caustic too.