GENEVA (AP) — Governments should have tougher rules for electronic cigarettes — banning their use indoors and putting them off limits for minors — until more evidence can be gathered about their risks, the U.N. health agency said Tuesday.

In a bid to set public policy, the World Health Organization said the popular nicotine-vapor products, particularly the fruit, candy and alcohol-drink flavors, could serve as gateway addictions for children and adolescents.

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