RY4 means a lot of different things from different manufacturers and I have enjoyed a lot of them! I recently picked up a bottle of RY4 Aces flavoring from DIY Flavor Shack and it ranks pretty high on my list. It has the good caramel over tobacco flavor that we’ve come to expect, but adds a distinctly smokey note. Good stuff. The great thing with a good mixed flavoring like this is that you don’t have to experiment with adding others. Just add it to your it with unflavored mix and vape. I’ve been using it at 6%.
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