Abstract:Relation of urinary cotinine concentrations to cigarette smoking and to exposure to other people's smoke Dr Simon Thompson and his colleagues measured urinary cotinine in 184 self repor- ted non-smoke...Relation of urinary cotinine concentrations to cigarette smoking and to exposure to other people's smoke Dr Simon Thompson and his colleagues measured urinary cotinine in 184 self repor- ted non-smokers (May 1990;45:356-61).Taking 10-30% of average smokers' concen- trations to indicate occasional smoking and over 30% to indicate regular smoking, they found two (1-1%) occasional smokers and no regular smokers among their non-smokers.Read More