For those of you who don't know, RY4 is a combo of vanilla, caramel and cream. Differing tastes have different amounts of the mixes. The vanilla is most of the sweet taste but is actually sweeter when mixed with the other flavors. The caramel is a strong taste, not so much caramel and not really sweet unless mixed with another. The cream gives it the smoke flavor but tastes strange by itself. The taste will vary because different vendors use different flavor bases as not all vanilla's taste alike nor do the caramels.
I have replicated the flavor by accident using a caramel flavored base and adding vanilla and Bavarian cream flavors to the mix. I actually like the
three flavors separate and usually keep some of each in their own bottle as well as some RY4 on hand. I almost entirely drip now so a drop of each just happens sometimes and mixes on the atty. Different mixes of these and others can be very different but good to. Bavarian cream and English toffee is a very interesting flavor, more like a
tobacco mix but good. The flavors are much harder to get just right, because of the diminished nicotine content the flavors are weaker when mixed.