Negative health, social and economic consequences of smoking tobacco are widely known. Recent years have seen the emergence of many commercially sold appliances for inducing nicotine into the airways, including products such as "e-cigarette", "E-cigar" and "green cigarette". These products are often promoted as potential alternatives to nicotine replacement therapy. It transpires, however, that there is a lack of conclusive evidence concerning the health effects of long-term use of chemical substances applied via those electronic nicotine inhalers. Reliable data on the exact chemical composition of the cartridges used in the inhalers is also missing. The objective was to present the main conclusions and recommendations of the World Health Organization Tobacco Control Research Team regarding electronic nicotine delivery devices, which were formulated against the principles of the WHO Framework Convention on Tobacco Control (FCTC). Based on several analyses, WHO recommends a ban on disseminating information that suggest that electronic nicotine vaporisers are safer than cigarettes, or that they are an effective way of combating nicotine addition, until appropriate evidence can be provided. According to the WHO recommendations, references to efficacy of electronic vaporisers for quitting smoking or to their health effects must be backed by reliable pharmacokinetics studies, safety and efficacy tests and appropriate certification from regulatory bodies.