My point is, going by the language in what you linked, the manufacturer you went with sells neither electronic devices nor devices that facilitate the use of any liquids/oils. So it does seem like their dumb policy/cautiousness not them being forced, though I am not a lawyer. Even being strict, if there was a device they sold that fell under the law I think it'd be the torches, as you said if someone has a lighter and material+paper or anything else that's all that's needed for smoking.

I was pointing out another manufacturer (quite popular/known and they only do electronic stuff, but AFAIK nothing for liquid/oils) and they have not bothered with this policy at all. They do allow the customer to request a signature check, but that's all I see.