A study of wood impregnators in Norway and Sweden found elevated rates of the lip and a skin cancer in creosote exposed workers. The researchers looked at cancer incidence in a group of 922 men who had worked in the industry at some time in the period from 1950 to 1975, using national cancer registries.
S Karlehagen and others. Cancer incidence among creosote exposed workers, Scandinavian Journal of Work Environment and Health, volume 19, pages 200-207, 1993.