Essential oil components were isolated from Korean aromatic tobaccos by using a simultaneous distillation and extraction apparatus. The essential oils were analyzed by GC/M S and date system. Forty-two volatile components were identified on the basis of their mass spectra. Determination of contents of essential oil components from Hyangcho and Sohyang was achieved by pseudo-multiple ion selection (Ml S) technique. Varietal differences were detected from the quantitative comparison of the MIS data.