I heard it said last night that it's *flavored* e-cigarettes that are thought be harmful. If that's true then one could argue in favor of regulating...or banning... the flavored ones.
I can't see an "addiction" to nicotine to be any worse that an "addiction" to caffeine.
I think that the objection to the flavored juice is that it seems to be targeted to children, which indeed it is. Getting a new generation addicted to nicotine is obviously crucial to the long run viability of the tobacco growers, so they are shameless in pushing bubble gum flavored vape gear.
Don't kid yourself. I have been a life long coffee drinker and never have I felt compelled to get up and seek a cup of coffee like I was when out of smokes.
And I quit smoking 40 years ago. If I can't get coffee I just drink something else like caffein free diet Coke.