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The riddle of association, causation and the prevention of subarachnoid haemorrhage
  1. Issam Awad
  1. Correspondence to Dr Issam Awad, U Chicago, Neurosurgery, 5841 South Maryland, MC3026, Chicago, IL 60637, USA; iawad{at}surgery.bsd.uchicago.edu

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Smoking has been suggested as an independent risk factor of subarachnoid haemorrhage (SAH) in multiple populations with varying ethnicity. Yet, while smoking cessation has been shown to mitigate the added risk of coronary artery disease in smokers, this has not been assessed previously in SAH.

Kim and colleagues from the Seoul National University Hospital in South Korea studied the relative association of current smoking, never smoking and past smoking in a nationwide sample of 426 patients with SAH from 33 Korean hospitals, in comparison with age- and sex-matched controls …

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