Me again--I checked the Cutter website, and it looks like the backwoods Cutter (is this the one you had?)has DEET rather than picaridin like the sport version that I tried. I think you may be right about body chemistry having an effect on how these things work, but I tend to be a real mosquito magnet and found the sport version to work really well in a campground in the woods at the beach. The mosquitoes there were merciless. Just thought you might want to check your can to see if it was the deep woods or sport. Thanks for reading so many of my reviews!