The purpose of this study was to investigate the carcinoembryonic antigen (CEA) levels among smoker and nonsmoker workers who work in a tobacco factory. The control group was farmers who live in a rural area. Among the smokers and nonsmokers who work in the tobacco factory, the mean serum CEA levels were not different statistically (p>0.05). But, in the control group mean serum CEA levels were significantly different between smokers and nonsmokers (p0.05). Ancak, kontrol grubundaki ortalama serum CEA düzeyleri ile sigara içenler ve içmeyenlerin düzeyleri arasında anlamlı farklılık saptandı (p