Highly concentrated flavours, which needs to be dosed into separate bottle and fill with PG-VG base and nicotine boosters. This allows you to affect total volume of e-juice, nicotine amount and also PG-VG ratio.
Even there are always dosage stated by manufacturer, you can easily adjust them by adding more or less of flavour to reach desired taste intensity. You can also made a mixture of more flavours together and create your very own e-juice recipe.
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