Hey Refrigerator, can I share the history of how that was discovered?
1860's India, when Britain was in occupation? The officers didn't contract malaria near as often as the enlisted men, and about 20 yrs. ago someone decided to look into that bit of trivia.
It turns out that the flavoring in real tonic water is a derivative of the drug that treats malaria!
Add in that no self-respecting creature likes the juniper that gin is made from, and the two are a combination that is hard to beat.
There's a spot in the middle of BC that's actually called HORSEFLY, and if you've ever been bitten by one of those flying vermin you know the nuisance they can be. I told an uncle about this trick, and that's where he put it to the test.
The fact that I don't like gin'n'tonic with a twist isn't the point: I've actually given this one a try, and in an area that is known for it's skeeters. Hubby got 'had', I was let alone, and skeeters prefer the lightest head in the room for some reason: I'm blonde.