I lost the flavor about a week into vaping. Like the others have said, use mouthwash and drink a lot of water. The taste will come back with a little time. If using cartos, as suggested, change out to a new one or clean some you may have lying around that have been used. I messed up and refilled one with a different flavor of juice. Almost made me puke because the taste mimicked that of puke. Pardon the visual. Also try changing resistance values. This helped with taste when I first started. Switching from LR to SR. If you are using a VV mod...Ego Twist or any VV PV, try playing around with the voltages to see if that helps. Depending on the juice and nicotine content, I have to adjust accordingly. While flavor may be amazing, my throat can't handle being punched more than a few times.
Good luck and don't give up!