The intrinsic hole photogeneration process in different phases of a smectic liquid crystalline photoconductor, 2-(4'-octylphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) was investigated as a function of electric field and light intensity by using the time-of-flight transient photocurrent technique. The collected photogeneration charges were found to be approximately proportional to the square of the light intensity irrespective of the phases. A model assuming Onsager type of carrier generation in involving double-exciton interaction process gave a good agreement with the obtained experimental results. The molecular ordering is found to promote the dissociation of the electron-hole pairs. The thermalization distance, r(0), was very large and comparable with those in molecular crystals such as anthracene, indicating that the carrier generation process in smectic mesophases is analogous to that in organic molecular crystals rather than that in organic liquids.