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Blood carboxyhaemoglobin levels estimated in 10 healthy asymptomatic cigarette smokers revealed a mean of 8.32±1.37% in the early morning after an abstinence period of 9.0±1.17 hrs. After the smoking of four cigarettes the level was 15.27±2.1%. the data revealed a higher basal COHb levels in smokers that increases further after smoking.