Since the day I started to vape, a fair amount of people tried to talk down of my vaping, saying it was "unhealthy, and not a proper and fool-proof way to quit.
Well... I ask them, "Okay, if this hasn't worked, even though I don't smoke anymore, what is?" ...They usually are rendered with silence.
But in all seriousness, why can't they call these a quitting method?
Because you're not.
I'm convinced that many people are opposed, not to smoking, but to the idea of smoking. Put frankly, drug use for recreational purposes is stigmatized in Western culture for the most part. It's seen as selfish (selfishness is ANOTHER stigma in Western culture, damn it!) and indicative of a weak person. Those social mores affect people's reaction.
"I am no longer inhaling harmful toxins from the habitual inhalation of combusted plant material." is not nearly as important to those blinded by drug stigma as "I am choosing to ingest a chemical substance for pleasure".