An academic book. I skimmed it to focus on the parts that interested me, which were very interesting. It happened to include a lot of material about how people viewed the role of scent during various plagues.
This was an occasionally interesting foray into medical history, cultural history, and the plague years, and how scent was key to medical treatment and divinity in antiquity. I guess we can count ourselves lucky (??) that we weren't ordered to burn aromatic woods and blast cannons down the street during the covid years...