WHO: “E-cigarettes as consumer products are not shown to be effective for quitting tobacco use at the population level” The WHO’s insistence on throwing around untrue statements about the alleged lack of proof of the products’ smoking cessation potential, is greatly contributing to the million of smoking-related deaths that the group says it wants to tackle. The study involved 1246 adult participants smoking at least five tobacco cigarettes daily, who expressed the intention to set a quit date.