On the Vapors Tongue thing, looks like the its been resolved.
We discussed it a bit here, but as a recap from what Ive experienced personally and info we gathered collectively through the thread:
It happens the most when you are first switching. It seems what causes it is your sense of taste returning and getting overwhelmed or "burned out". Its not really your taste buds though.
Its also rather common.
It used to happen to me all the time. What helped me alot, was a flavor rotation.
I try to have 3 different flavors. But at least 2 throughout the day.
In regards to these flavors, try to make them drastically different from each other. If you vape a fruity type flavor often, lets just say Strawberries and Cream, then a second flavor ideally should have no strawberry or cream notes in it.A tobacco, menthol, cinnamon or other bakery type flavor would do the trick. Just make sure they are very different from each other.
If for example you vape Deadly Sin all day long and get the vapor tongue. Switching to something like Cinnamon danish may be effected as well due to the bakery cinnamon notes.
Drink LOTS of water when vaping. Believe it or not this helps too.
If you have 2 tanks set uop with drastically different flavors, swithching off will help. You'll likely be able to go back to the other flavor after 30 minutes or so, maybe an hour and all will be well again.
And, one other little thing that I read about that does help a bit. Don't laugh!
When it happens, take big deep breath of some fresh coffee grounds!! Not used, but fresh. It kinda shocks your sense of smell/taste back into action. Weird, but does work.