This WHO Technical Report Series report makes available the findings of an international group of experts that provide WHO with the latest scientific and technical advice in the area of product regulation. The third report presents the conclusions reached and recommendations made by the members of the WHO Study Group on Tobacco Product Regulation at its fifth meeting, during which it reviewed two background papers specially commissioned For The meeting and which dealt, respectively, with the following two themes: devices designed For The purpose of nicotine delivery To The respiratory system in which tobacco is not necessary for their operation; and setting regulatory limits for carcinogens in smokeless tobacco. The Study Group's recommendations in relation to each theme are set out at the end of the section dealing with that theme. Its overall recommendations are summarised in section 4. The Study Group intends this new set of recommendations to be useful to WHO Member States and national policymakers and regulators in shaping tobacco control policy.