Got some RY4 that was not very strong and some Caramel that was TOO strong; both were 24mg and from Gourmet Vapor. I put about ten drops of the RY4 in the carto yesterday when I got the juice. Only hit it a few times because it didn't really taste very good. Today, I put a 6 drops of the Caramel in the same carto and shook it up a bit (feble attempt at mixing?) and it tasted WONDERFUL. My girlfried tried it and asked me to make some for her. So I guess it's good. I have some Cuban Cigar too. I'm thinking about putting a couple drops of that in there; maybe it'll taste like Tennessee Cured.