I'd really strive to get the no nic version of the same flavor, if you don't have your own add-in flavorings that are at least close enough. A 2/3 cut (1/3 18 mg/ml eliquid, 2/3 plain VG) will turn even a pretty high flavor eliquid into a "meh" one. A cut of 20% is generally manageable, but this is 67%.