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We have proposed a photonic crystal fiber (PCF) based sensor to sense toxic carbonyl air droplet found in cigarette smoke. A circular lattice PCF has been designed with four air holes ring in the cladding region and the circular shaped core used for analyte fill-up. In the proposed PCF, elliptical air holes are also used in the cladding region to improve guiding properties of the PCF. The commercial software COMSOL Multiphysics 5.3a has been used to simulate the entire geometry and to find out different optical parameters such as relative sensitivity, confinement loss, effective material loss (EML) and effective mode area at frequency range of 0.5 THz-1.5 THz. To find out the optimal geometrical conditions of the proposed PCF sensor, cladding air holes strut has been varied. At optimal conditions, simulation result shows that maximum relative sensitivity of 69%, 72%, 74% has been achieved for acetone, acrolein and …