Book excerpt: Toxicological Evaluation of Electronic Nicotine Delivery Products (ENDP) discusses the scientific basis for the toxicological assessment and evaluation of ENDPs. The book covers aerosol chemistry, in vitro and in vivo studies as well as clinical studies. It provides the basis for the evaluation of short and long term-effects, along with relative risks. It also examines the potential role of ENDPs in tobacco harm reduction and how they may reduce the risk of disease in smokers who switch to them. This book is a comprehensive resource for toxicologists, health practitioners and public health professionals who want the scientific information necessary to assess the relative risk of ENDPs when compared with cigarette smoking and cessation. - Delivers a comprehensive overview of current state of science - Offers an integrated analysis of e-cigarettes and heated tobacco products - Provides guidance for methodologies