They are testing for another substance (Methemoglobin) that your body produces in response to the breakdown of nicotine
By World Health Organization region, nine of the studies were from Europe (Denmark, France, Spain and the UK), 17 from the Americas (Brazil, Canada, Haiti and the US), seven from Africa (Rwanda, South Africa, Tanzania, Uganda and Zimbabwe), two from the western Pacific (Australia and China) and just one from south-east Asia (India)

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its almost as if I can smell the smoke and the the -adventure!- -The New York Times-