The standard MT3 clearo which is the delivery device that comes with the 'kit' uses tiny pieces of silica wick, a 2.4Ω coil & very restrictive airflow.
Best used with 50/50 pg/vg because any higher vg won't wick reliably.
It is important to wet the wicking material with liquid (prime), fill tank, let sit for a few minutes before pushing the fire button.
Also, always start off a new / unused head at a low power setting & gradually work your way up to prevent scorching & burning.