The Advertising Standards Authority of Ireland has released its new code of standards for advertising and marketing.
It includes new rules for gambling, food and e-cigarette advertising, as well as those targeted at children.
Under the new rules, e-cigarette makers cannot make health or medical claims about their product, should not associate them with tobacco brands or products, and cannot present them as an alternative to tobacco.
The Chief Executive of the ASAI, Frank Goodman, says the new rules will come into effect next March.
He said: "E-cigarettes have always been subject to the general provisions of our code regarding social responsibility and not being misleading.
"Because of the growth of marketing in that area and societal concerns, we have introduced particular rules.
"The advertising has to be socially responsible, the advertising cannot involve young people, it can't have people who are less than 25 or look less than 25."
The Irish Vape Vendors Association welcomed the new code, but said: "Perhaps it’s worth emphasising that IVVA members are not part of the tobacco industry.
"We do not sell tobacco products, but rather an alternative that carries a vastly lower risk. Our members therefore would have no interest in promoting our competitors’ products.
"In order to maintain the massive public health gains that these products offer in reducing the harm from smoking, it’s important that advertising restrictions be proportionate.
"Reaching adult Irish smokers with socially responsible advertising of these alternative products that carry such a lower risk profile compared to tobacco cigarettes, is vital."