When we talk about vaping, Direct to lung setups may be looked at as the most popular way to do so. The concept behind DL setups are that when users inhale vapour, it goes directly into the lungs, very different to a Mouth to lung (MTL) setup. DL vapes are popular because they can produce a large amount of vapour compared to MTL vapes. 

First time users of DL vapes can find discomfort from use because of the large amount of vapour that is being produced and may cause coughing. 

The mouth piece on DL vapes are significantly wider compared to MTL vapes to cater for the larger amount of vapour produced.