When you prime a new/unused head by thoroughly saturating all exposed wicking material with e liquid, fill the tank, set the power level, press the fire button & inhale it should produce vapor, not smoke.
You might be confusing folks because it can produce smoke if you burn dry wicking material, which is a bad thing, do not inhale if it is producing smoke.
If it is reading .148Ω most likely you're using the .15Ω t8 quad coil. Starting with a fully saturated head 50w might be a good starting point, gradually increase power to find what you like best.
The whole set up is for a direct to lung inhale style (a wide open airflow deep, hard, fast inhale) if you're trying to mouth to lung (a restricted slower & smooth airflow inhale style most commonly associated with smoking a cigarette) it is going to be harsh & produce little vapor.
Pg/Vg ratio & nic mg/ml will play a part in vapor production & harshness also.