Title Item Type No Grouping Silverwood, RJ; Mansfield, KE; Mulick, A; Wong, AYS; Schmidt, SAJ; Roberts, A; Smeeth, L; Abuabara, K and Langan, SM (2020). Clinical Codelist - Smoking Read codes. [Dataset]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00001985.