Review of Blueberry Cinnamon Crumble Flavor -Cap:

I was using this at 5-6% and barely got the taste. Then I checked out these reviews and saw the recommendation to start at 4% (I went through 1-5% when I first got it, but I guess I wasn't paying enough attention). 

At 4% in a Kayfun at 15 watts you taste a candy blueberry, a little cinnamon and mush pastry. Good like all Cap's flavors.