Abstract: An olfactory special effects system includes a plurality of scent cartridges that contain respective substances for generating different scents. The system also includes a scent delivery unit having a plurality of compartments to contain the scent cartridges, a device that generates an airflow, and a mechanism that moves the scent cartridges from the compartments into the airflow to create a scented airflow. The scent delivery unit also includes a controller that controls the mechanism to move different scent cartridges at different times during the presentation in order to release different scents in response to cues from the presentation. The olfactory special effects system also includes a scent outlet vent to deliver the scented airflow to the audience members. The system further includes a scent ductwork to channel the scented airflow from the scent delivery unit to the scent outlet vent.