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Abstinence from smoking and expired-air carbon monoxide levels: lactose intolerance as a possible source of error.

A D McNeill, L A Owen, M Belcher, G Sutherland and S Fleming

Addiction Research Unit, Institute of Psychiatry, London, UK.

We investigated a possible source of contamination of expired-air carbon monoxide (CO) readings on CO monitors from raised expired-air hydrogen (H2) levels, namely lactose intolerance, the norm in certain ethnic groups. A significant correlation between expired-air CO and H2 readings was observed in four non-smoking lactose maldigesters.

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