A washing machine appliance may include a cabinet, a tub, a wash basket, a drawer, an air inlet, and an air outlet. The cabinet defining an opening to receive articles therethrough. The tub being positioned within the cabinet. The wash basket being rotatably mounted within the tub. The wash basket defining a wash chamber for receiving articles for washing. The drawer mounted to the cabinet. The drawer defining a compartment to receive a scent additive therein. The air inlet line extending from the compartment in downstream fluid communication with the wash chamber to direct air therefrom. The air outlet line extending to the compartment in upstream fluid communication with the wash chamber to direct air thereto.