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doi: 10.1093/ije/dyw227 Advance Access Publication Date: 27 January 2017 Commentary: The formal approach to quantitative causal inference in epidemiology: misguided or misrepresented? Rhian M Daniel,* Bianca L De Stavola and Stijn Vansteelandt LSHTM Centre for Statistical Methodology and Medical Statistics Department, London School of Hygiene and Tropical Medicine, London, UK and Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, Ghent, Belgium