I read where it is your body giving off carbon dioxide so the more your body puts off the more bugs you draw. I have the same problem with bugs. and I hate them
Don't worry too much about that DEET taking some years off your life. If you live too long, you won't be able to effectively surf fish in the right structure anyway.
Green Ban for People works the best for me. I've tried all the super deets out there and they really don't compare to this stuff. It is all natural though, citrus and peppermint oils.