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"A.Appleyard" <A.APPLEYARD@fs*.me*.um*.ac*.uk*> wrote: >> I have heard many times from non-smokers that smoking is a contradiction to >> diving. ... > Y is a contradiction of X = information in Y does not match information in X > Y is a contra-indication of X = if you do or have Y you are advised not to >do or have X. > Which is intended here? You're being a little puerile here, Tony. Fairly obviously, from the context, contra-indication is what was meant. "Diving implies non-smoking" is easily disproved by counting the fag butts round Gildenburgh. :-) I have heard it that smoking just before a dive is contra-indicated because of the residual carbon monoxide. Is there any evidence that this is a problem? How long a respite should smoking divers give their lungs to reduce the problem? Presumably there's also some airway closure and consequent effect on peak-flow etc from the respiratory irritation. Again, how long do the lungs take to recover after a cig? mike. ___________________________________________________________________________ Mike Salmon, Climatic Research Unit, | University of East Anglia, Norwich, UK | SCUBA diving in the United Kingdom m.salmon@ue*.ac*.uk* +44-1603-592875 | http://www.cru.uea.ac.uk/ukdiving/
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