Hey julbug, I started vaping mid June and felt tired,happy,sad,dehydrated,grouchy,hungry,mad you name it.
However my body was/is adjusting from camels 2 pack a day
35 yrs to just 1 or 2 a day!
Don't sweat it every day gets a little better!
I still smoke 1 or 2 analogs a day - when enough time...