Well to take it to the extreme for example, you could get 1 ohm from 24g kanthal at 14 wraps with 2mm ID and at 3.8 volts you'd take a while to ramp up and get any kind of decent vapor/hit.
Or 30g kanthal at 4 wraps on 2mm and 3.8 volts would turn that coil white almost instantaneously.
Both are rather impractical builds, just saying ohms is just one small part of the equation.