In vaping there are two popular styles in which you can vape: MTL (mouth-to-lung) and DTL (direct-to-lung). MTL devices have small air flows. They work similar to traditional cigarettes. When you smoke cigarettes the smoke first reaches the mouth, and dragged into the lungs. It is the same for MTL vaping devices, the vapour is first kept in the mouth then goes into the lungs.

For DTL devices, the air flows are larger which allows for a greater quantity of vapour to enter the device. This vaping style is similar to smoking a shisha, where the vapour goes straight into the lungs.