Harry Tattan-Birch is a doctoral student in the Department of Behavioural Science and Health at University College London (UCL). He is a member of the UCL Tobacco and Alcohol Research Group, specialising in the applications of statistical and epidemiological methods for research into nicotine products. His PhD thesis focuses on the public health impact of e-cigarettes and heated tobacco products. He is currently leading the Cochrane Review into heated tobacco products.