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Highly Precise: know the smoking status by detecting Nicotine with Cotinine metabolite resulting from tobacco, vaping, cigarettes, e-cigarettes, nicotine patches, and nicotine gum use STABLE MARKER: Cotinine is stable determining nicotine use minimum detection 1-8 hours and max 1-7 days for teens or adults

Although some epigenetic changes induced by tobacco smoke appear to be stable and persist into childhood or even adulthood (39,43), it has been suggested that cessation of smoking, especially before or during early pregnancy, can reduce the extent of fetal exposure and limit epigenetic disruptions

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If filters removed long-wavelength signals, or a green-coloured glove was worn, they did not