Thanks you give me an idea that i should test them one by one. Now my question is complete...i will try them all
Do not vape that flavoring. As many have posted above it is not meant to be vaped.
If upon switching to a flavor that is meant to be vaped, you still have the problem.. then it could be that your not staying hydrated enough. PG is drying.. Dehydration can cause headaches and a tired feeling.