It kills most ants and flying insects, and most especially fruit flies. You can shoot them out of the air with practice. I keep several small sprayers: kitchen, bathroom, west facing window... It does not kill spiders though.
OK OK I miss-used the word toxic. What I mean is it's not roundup, its not pesticide. You aren't going to get cancer if it gets on your skin. You aren't going to keel over and die if you accidentally breathe some of the vapours after you slaughter some fruit flies. And those of you who have open flames around your house (why?) please dont use this method.