Plans to ban under-18s in England from buying electronic cigarettes will also apply to Wales after a vote by the Welsh Assembly.
AMs backed a Welsh government motion to allow Westminster legislation bringing in the ban to cover Wales as well.
Welsh health minister Mark Drakeford told AMs that e-cigarettes were a “gateway product” and “we do not want our young people to be able to use them to go on to using something far worse”.
“The proposals in front of the assembly today are, I believe, practical, proportionate and, where e-cigarettes are concerned, properly precautionary,” he said.
The changes in the law are being introduced in Parliament through an amendment to the Children and Families Bill.