Well, depends on if you believe in the concept as it's applied.
The typical definition of a vice indicates something with is depraved, immoral, or makes one a defective person.
Is
vaping really any of those things? Is smoking?
No. I don't think so.
I think we throw around words designed to degrade people for being people (both ourselves and others) too easily, Sin, vice, and some more vulgar words ECF probably censors.
We live in a society that wants us to believe we are inherently wicked and need to be fixed. We are, after all, the product of a Puritanical society. And I don't buy into that.
A vice, in the true spirit of the definition, would be something like being a being a hit man or a dishonorable thief or a human trafficker.
vaping, and even smoking, is nothing like any of those things.
I am not evil or broken or defective for being an addict. I'm just a human being, who happens to be addicted to something that is socially frowned upon. The world is full of sugar and caffeine addicts, who experience serious and debilitating withdrawal if they try to quit. But they don't get the flack smokers/vapers do.
Addiction is an unfortunate reality of humanity, but it's not wicked or morally wrong. I won't let myself be shamed over it, nor apply shaming words to myself or others over it.
Vaping makes me an addict, a hobbyist, and to some degree an activist. But it doesn't make me immoral.