The Australian government has been phasing out smoking entirely for a while now. Vapes came in and undid most of that effort as well as getting a new generation of kids on it. So now they are regulated to only be allowed as an aide to get off cigarettes.

Mostly due to imports of disposable "nicotine free" vapes that of course contained nicotine. Banning them outright makes customs easy as otherwise you would have to test every import for nicotine levels.

There's zero benefit to society to import any disposable vape variant, so the ban is pretty well received.