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Long term smoking contributes to cognitive decline

BMJ 2004; 329 doi: http://dx.doi.org/10.1136/bmj.329.7478.1306 (Published 02 December 2004) Cite this as: BMJ 2004;329:1306
  1. Roger Dobson
  1. Abergavenny

    Researchers have found that among people who had their IQ measured at the age of 11, smokers had the greater cognitive decline by the age of 64. Smokers also had lower psychomotor speeds.

    “We conclude that long term smoking does not produce long term cognitive benefits; to the contrary, smoking makes a small but significant contribution to cognitive decline from age 11 to 64.

    “Current smokers and non-smokers had significantly different mental test scores at age 64. This difference remained after adjustment for …

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