UPDATE: Yes, they sold me the wrong coils. The guy there today immediately recognized that they were wrong and just swapped me a box of the right ones. So that's figured out. He said you replace it about once a week, depending on use.
While I was there I decided to upgrade a bit and walked out with an Aspire ESP30 and a Nautilus Mini. Bigger tank, bigger battery...that should lower my blood pressure a bit.
One question, though. I can adjust the watts of the mod. But the guy at the store said something about not turning it up past, like, 11 with this tank on it. It comes with a 1.8 Ohm thingamajig. Is there wattage that you shouldn't use on it? Are there different Ohm thingamajigs that I could get if I wanted?
Yes there is a wattage range that a coil will work at.
If you go too high, you start burning stuff.