Everytime I type out the term "e-cigarette", I cringe. It just doesn't feel right and by continuing to use this term, we really lump in vaping devices with cigarettes, IMO. But, and maybe I am wrong in this, when I discuss or write about vaping, I just feel most non-vapers won't know what a personal vaporizer is but would know what in e-cigarette is. On Twitter, you see a lot of #e-cig and #e-cigarette, and #vaping, but never #PersonalVaporizer or #VapingDevice. So I've just gone with the flow.
It's unfortunate nomenclature we seem to be saddled with, but I would sure rather we weren't.