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Forbes, H and Bhaskaran, K (2018). Clinical code list - Smoking use. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000990.

Forbes, H, Bhaskaran, K, Thomas, SL, Smeeth, L, Clayton, T and Langan, S (2014). Clinical code list - smoking codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.167.

Forbes, H and Langan, S (2018). Clinical codelist - Smoking codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000836.

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Greenhall, G, Mansfield, KE, Nitsch, D, Iwagami, M, Leyrat, C, Johnston, R, Smeeth, L and Tomlinson, LA (2019). Clinical codelist - Smoking status. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom.

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Matthews, A and Bhaskaran, K (2017). Clinical code list - Smoking. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.196.

Matthews, A, Langan, S, Douglas, IJ, Smeeth, L and Bhaskaran, K (2016). Clinical code list - Smoking codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.168.

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Schonmann, Y, Mansfield, KE, Hayes, J, Roberts, A, Smeeth, L and Langan, S (2018). Diagnoses code list - Smoking Read codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000937.