Seeing as it isn't 1.2ml of O-ethyl S-[2-ethyl] methylphosphonothioate I wouldn't be overly concerned about a garage sized enclosed area.
1.2ml in a closed coffin might be a bit of a worry to me on the other hand, especially if the coffin were 6' under the general topography I tend to enjoy standing upon.
As most have stated here, the flavorings we use, in the quantity we use, are in the realm of innocuous. You could have used the same exact flavoring to make pulled taffy where you would be intentionally there manually working the flavoring into a plain taffy.
The flavors are in actuality more often used in that very way.
In other cases the flavor is also used as a scent, flavors are remarkably the same thing in terms of chemical makeup. It is the use that mainly makes the difference. Spill a bottle of perfume! Get a mop! Spill a of flavoring! Get a mop! Dog takes another dump in the living room, don the gas mask, grab the paper towels ... it isn't pleasant I'm sure.
Maurice