They are designed to be used at higher voltages as in user
mods operating at 5v or 6v. They won't get hot enough at 3.7 to vaporize your liquid.
It's kind of like light bulbs for different voltages. The filament is lighter or heavier to match the load to battery voltage. A 3 cell bulb in a 5 cell flashlight will last about 5 seconds, but will burn really bright for those 5 seconds.