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The temporal derivative of the raw time-series was computed, and the peaks and troughs of the derivative time-series were used to define the start and end of each smoking event

More studies are required to approximate whether concomitant e-cigarette use was the cause of these conditions or whether additional confounding factors played a role

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Cotinine in Youth and Secondhand Smoke Detection Even one cigarette can raise cotinine in teenagers and young adults

You may also want to remember the Hippocratic Oath taken by all Doctors and Physicians and the message it delivers : Do No Harm 10 April 2017 Hi Graham, Thanks for your comment