Comment by bjackman

Yeah exactly. If I move elsewhere for like 30s I'll get bitten. Or my ankles will be exposed or something.

Same with incense-style repellents, I'm pretty convinced they reduce the number of mosquitoes but eventually one will be attracted to me via some path where the repellent isn't currently flowing and I'll get bitten regardless. (I think that smoke is also probably pretty bad for you if you use it a lot, too).

And since the difference between one bite and zero bites is a really big deal I usually just go for on-skin repellents.