DISCLAIMER: I haven't made or tasted this recipe yet, but being very familiar with TFA flavors, and having been a mixologist in NYC's top bars, I can tell that this is a great twist on the classic, and the percentages are balanced well. However, I strongly disagree with the chef's claim that this is a Shake-n-vape recipe. Few of TFA's concentrates are shake-n-vape; Vanilla Custard and Marshmallow both are, but the rest of them need to steep for 4 or 5 days at the least; 10 days would be ideal. TFA flavors tend to be too perfumy, and sweet on the nose when not allowed to steep. Oxidation is an imperative to bring out the nice round flavors these concentrates can produce. I'll drop and edit after I try this recipe for myself. I just need Juicy Lemon, and I order every other week, so it will be soon. Good luck All!