• Ansa Theron, Cedric Schultz, James A Ker, and Nadia Falzone.
• Lung Unit, Department of Internal Medicine, Steve Biko Academic Hospital, School of Medicine, University of Pretoria. theronansa@gmail.com
• S. Afr. Med. J. 2010 Feb 1;100(2):122-4.

UnlabelledWater-pipe smoking is growing in popularity, especially among young people, because of the social nature of the smoking session and the assumption that the effects are less harmful than those of cigarette smoking. It has however been shown that a single water-pipe smoking session produces a 24-hour urinary cotinine level equivalent to smoking 10 cigarettes per day.AimWe aimed to measure carboxyhaemoglogin (COHb) blood levels before and after water-pipe and cigarette smoking sessions.MethodSelf-confessed smokers older than 18 years (N=30) volunteered to smoke a water-pipe or a cigarette and have their blood COHb levels measured under controlled conditions.ResultsMean baseline COHb levels were 2.9% for the 15 cigarette smokers and 1.0% for the 15 water-pipe smokers. Levels increased by a mean of 481.7% in water-pipe smokers as opposed to 39.9% in cigarette smokers.ConclusionThe study demonstrated that water-pipe smokers had significantly higher increases in blood COHb levels than cigarette smokers during a single smoking session.

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