Hey there dotma,
I have been vaping for about four months now, and my tiredness has been a problem since the beginning and has yet to go away.
And it's not because of anything having to do with smoking. I switched to vaporettes -- as I like to call e-cigs -- from the gum and the patch. I had always missed the inhaling feeling of cigarettes, and I really do enjoy these things. And I have found that actually wearing the patch as well (a minimum strength one) does help with the tiredness, but not enough to really feel normal. I also feel very undermotivated. Work is hard to get done.
And yes, to everyone who's going to mention hydration, I drink an obscene amount of fluids, so it's not that. And it's been four months now, so it's not a phase, it's not about to clear up tomorrow, it's not because I am sick or stressed or overworked or any of those.
I would love to hear if other people have had this specific problem or are familiar with it from friends or patients or whatnot. This tiredness is a real issue that I have with these things -- and one which I didn't have with the patch or gum -- and I would hate to give them up but I am afraid I might have to.