To begin with it is unrealistic to start referring to them as “weed vaporizers” because that is not their intended usage. They are considered to be aromatherapy devices. The daily mail article also refers to children using them which is slightly harsh as all reputable retailers would implement an “over 18s” policy.
Home vaporizers are quite large and expensive which is not really something that a child is ever likely to find appealing. The portable vapes are also priced well beyond pocket money levels – even if a child could get hold of a credit card to order them!