If I was doing it, instead of trying to go after Thousands of Packages every week, I would Lean on the Credit Card companies.
But I'm Not doing it. So take it for what It is Worth.
They've already done that to an extent. In the USA, they deemed vape as tobacco, which in turn deemed vape purchases as "high risk" which in turn forbids 3rd party payment processors from processing payments for vape. Paypal and the like aren't allowed to take on "high risk" purchases like tobacco, firearms, online casinos, etc. in the USA.
The next step would be to deem tobacco all sales online as "forbidden" and credit card processing reseller companies will be forced to drop all vape shops.
It's the "best" way to control commerce. But then it goes to the black market, which is less-than ideal for the public at large.