Blood and Urinary nicotine in non-smokers.

Of 39 urban non-smokers about half had measurable quantities of nicotine in their plasma (range 0 to 5times5 ng. per ml.) and almost all had nicotine in their urine during the early afternoon. The average concentration of urinary nicotine in non-smokers under natural conditions was 10times7 ng. per ml., but after deliberate exposure to tobacco smoke (mean… CONTINUE READING