I smelled a lot essential oils and I only tried sweet flag in my mix, it was gross, I had to boil my nautilus for hours before the taste got out. There was some oils that I marked "MAYBE", but I did not want to spend 20$ a bottle for 5-6 failures. I may buy them one by one in the future, I'll see.
Seriously I feel that spearmint with eucalyptus is the key. It doesn't taste like spearmint, and doesn't taste like eucalyptus. They react surprisingly well together. But like I said, maybe I'll vape it tomorrow and it will be another story