In this podcast, Rachael Moses, Multimedia Editor of Thorax BMJ, talks to Dr Ash Clift Nuffield Department of Primary Care Health Sciences, University of Oxford.

The evidence surrounding COVID-19 has been conflicting and inconsistent. This podcast discusses the findings of this observational and Mendelian randomisation study using the UK Biobank cohort. The author discusses the findings with regards to the potential causal effect of cigarette smoking on the severity of COVID-19 infection and what this means for both the public and clinicians.