Air Flow Control
The majority of tanks now have an in built air control system whereby the user can increase or decrease the size of the apertures which they draw air through. This is useful when using higher or lower nicotine strengths and whether the users is inhaling directly into the lungs or taking a mouth to lung inhale. Cloud chasers now use extra large air holes and some even make the airholes bigger themselves to give maximum vaper inhalation.
Most tanks have a moveable ring at the bottom which rotates to give the option of several different size holes and some have a long slot which can be adjusted to the vapers preference. Some new drip tips and mouth pieces also have the option to adjust the airflow.