UWELL Whirl 20 Manuel D'utilisateur page 53

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Notes & Precautions
General Information about Puffing Techniques while Vaping
When vaping, a distinction is made between two puffing techniques:
Moderate Vaping (Mouth-to-Lung)
The vapor from an e-cigarette is first collected in the oral cavity for the entire duration
of the puff and then inhaled into the lungs. This puffing technique is referred to as
moderate, mouth-to-lung vaping and is similar to smoking. To achieve this, there
must be a noticeable resistance when puffing on the e-cigarette. Evaporator heads
that support this puffing technique in the moderate range (resistance usually > 1
ohm) are often referred to as MTL (mouth to lung) heads. (Other abbreviations
include ML and M2L.)