A vaporizer assembly, which includes a heating element and a conduit assembly configured to direct air to flow through a conduit in fluid communication with the heating element, further includes a dispensing interface assembly configured to be in fluid communication with both the conduit and the vaporizer assembly exterior. The dispensing interface assembly includes a first dispensing interface and a second dispensing interface. The first dispensing interface is in direct fluid communication with the conduit and the heating element. A portion of the second dispensing interface is exposed to the vaporizer assembly exterior. The second dispensing interface is isolated from direct fluid communication with the heating element by the first dispensing interface, and the first dispensing interface is isolated from direct fluid communication with the reservoir by the second dispensing interface. The second dispensing interface is configured to restrict a flow of pre-vapor formulation to the first dispensing interface.