Mouth to Lung (MTL) kits have been designed specifically to replicate the draw of a cigarette, to help you along your journey to stopping smoking. 

Not everyone wants to 'move up' to the Direct to Lung (DTL) kits, hense why there is so many different MTL kits available.

MTL kits generally are used for higher PG, 50/50 and Nic Salt e-liquids.