Polycyclic Aromatic Hydrocarbons(PAH) .Pott, 1775, chim ney sweeps, scrotal cancer . Carcinogens in soot and coal tar were PAhs ° Benzopyrene occupation smoking diet and air cutaneous occupational exposure skin cancer .Inhalation exposure: lung, bladder, pancreas and upper Gl•Pott, 1775, chimney sweeps, scrotal cancer •Carcinogens in soot and coal tar were PAHs •Benzopyrene •Occupation, smoking, diet, and air •Cutaneous occupational exposure: skin cancer •Inhalation exposure: lung, bladder, pancreas and upper GI Polycyclic Aromatic Hydrocarbons (PAH)