Ashby,
As a retailer of Bugitol - and a user - I'll give you the straight scoop:
Bugitol is a blend of two food-grade, FDA GRAS (generally regarded as safe) ingredients - essential oil of mustard and capsaicin oleoresins. When mixed with water, in essence, you are applying a combination of mustard gas and pepper spray. Both vapors are very irritating to the eyes and mucous membranes.
I recommend that it be used outdoors only, unless you have a full-face, organic vapor respirator (which is what I use in the greenhouse). I suppose I probably should, but I do not use other PPE.
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