Grape e liquids seem to be more popular than actual grapes. We vaped a lot of grape e juice and came up with this list of the best grape vapes available right now. Some are stright grape flavour juices and some are sweets flavoured with grape but they are all very grapey with no weird aftertastes.
If you are looking for grapes in a sweet candy format then Laffy by Clown and Grape Hard Candy are the ones to go for. For juicy grape vaping it's going to be any of the excellent Fantasi Grape E liquids. Trix is the most grapey flavour yet. For a "true to the fruit" ADV - try Grape Vape by FAR.