Example embodiments relate to a cartridge including a housing, a pre-vapor formulation reservoir configured to store a pre-vapor formulation in the housing, a vaporizer, and an airflow diverter. The vaporizer may be configured to vaporize the pre-vapor formulation. The vaporizer may include a heater and a wick, the wick may be in fluid communication with the pre-vapor formulation reservoir, and the heater may be configured to vaporize at least a portion of the pre-vapor formulation in the wick to form a vapor. The heater may be positioned in a transverse direction in the housing, and the airflow diverter may be located on an opposite side of the heater relative to a mouth-end portion.