I had the exact same experience but thankfully I gutted it out and things are tasting great again. Of course my tastes still change depending upon the time of day, what I've eaten or had to drink recently and how much water I've had to drink. Zotz really do help sometimes. Biotene gel has helped. Changing juices, mods, builds and even wicking material has helped too. Stick it out - even a so-so vape is better than a stinky cigarette!