The 40 mL tobacco flavourings contain the amount of flavouring pre-diluted in glycol to classically prepare 100 mL of finished product. To obtain the premix, the preferred BIY or ZERO base and glycerine must be added to complete the mixture. The preparation can be limited to a total of 80 mL obtaining a 12 % liquid or extended to 120 mL obtaining an 8 % liquid. We can therefore say that the total additions vary from 40 to 80 mL.