Colin Mendelsohn is an Associate Professor in the School of Public Health and Community Medicine at the University of New South Wales, Sydney, Australia. He is a medical practitioner and tobacco treatment specialist working in private practice and is Chairman of the Australian Tobacco Harm Reduction Association. He is actively involved in raising awareness of the public health benefits of tobacco harm reduction and advocating for the legalisation of vaping in Australia. His activities in the smoking cessation field include teaching medical students and health professionals, writing, research, public education and consulting to the pharmaceutical industry. Colin is a member of the committee that develops the Australian national smoking cessation guidelines and is past Vice President of the Australian Association of Smoking Cessation Professionals.