If you're interested in why a hard draw gives you juice in the mouth, here it is:
The wicking in the eGo-T and clones is controlled by airflow. This is why you take hard puffs without pressing the button to "prime" the atomizer.
If you look into the atty with the tank removed, you see the needle. You also see the silver plate with slats missing on two sides. When you draw, the air is pulled from the battery end, through the wicking, giving a venturi effect to pull juice through the needle wicking and onto the coil. The air goes up the sides of the tank, and into the mouthpiece.
So, if you suck too hard, it will pull the juice from the coil, up on top of the needle plate, and then straight to the tip!