When your recipe is lacking that "certain something", your flavours aren't blending together well or you need to take the harshness or dryness out of a recipe TFA Smooth might be the key.
If you want to create a "smoothie" or "cocktail" recipe, anything in which the flavours are blended together as opposed to eating different fruits one by one (and tasting them seperately on inhale/exhale), this is how you do it.
I recommend starting a 0.5% and increasing up to 1%.
As opposed to the Vaping Wizzard MTS (Mellow, Thick and Smooth) additive, this doesn't make your juice immediately turn dark yellow and doesn't gunk up your coils as badly.
When paired with things that are already "heavy", "thick" or rich, such as Vanilla Bean Ice Cream or Custard, use a VERY light touch as it seems to bring certain flavours to the front and mute others. I've found that it has a strong effect on bakery/dessert flavours and can mute out fruits when these things are in the same recipe.
It does work well when added to fruit recipes such as Apple and Strawberry or Grape and Blackberry to smoosh the flavours together and give a more rounded taste.