Electronic Cigarette Liquid DL

What is the DL liquid ? 
DL liquid lung shot or hookah shot e liquid is the same as e liquid e cigarette users when shooting steam from the larynx to the inside, i.e. almost to the lungs are the names given to the shooting style,for this shooting style the following 80% VG herbal 20% pg nicotine and Aroma content of e cigarette liquid is recommended