I never ever get bitten by mossies and I have always put this down, Gray, to being the same as you and consuming garlic in what most would consider, vast quantities. I just love to add the beautiful flavour of fresh garlic to any dish that I can.
Whilst in Egypt, I do find that I suffer "withdrawal" symptoms, as, when catering for the masses, most chefs will add less rather than more garlic to their cuisine. When I had my restaurant, however, I must admit to using just as much in my menu dishes as I would for myself! Not one person ever remarked or complained about the amount of garlic in the food.
I am considering taking garlic capsules on my next trip to Egypt as I'm sure that my digestion suffers without a good intake of this lovely ingredient.