Hazelnut cream and Washington cherry. THe hazelnut cream was worst. I really noticed it when I poured it down the sink. It was oily er than usual and I did try vaping the hazelnut and it tasted horrible.
Rather than dump them, I would have contacted the vendor and asked if this was normal. Perhaps sent them back for verification as to whether the juice was OK.
E-liquid does have a different feel (although I'm not sure I would describe it as "oily"). I have also found that many "cream" liquids need time to mature. Many e-liquids can taste horrible right out of the mailbox, but improve greatly with airing and aging. (So-called "steeping").