For the purposes of this Part, a person
"engages in e-cigarette retailing" when--
(a) e-cigarettes or e-cigarette accessories are sold by retail in the course of the carrying on of a business that is owned, managed, conducted or operated by the person, or
(b) the person is the owner or lessee of an e-cigarette vending machine that is situated on premises for the purpose of the sale of e-cigarettes or e-cigarette accessories, or
(c) the person is the occupier of premises on which an e-cigarette vending machine is situated for the purpose of the sale of e-cigarettes or e-cigarette accessories (whether or not the vending machine was placed there by the person).