A nicotine delivery system is disclosed. The nicotine delivery system comprises an actuating mechanism and a housing that has a longitudinal axis and defines a chamber that is configured to receive a plunger and has an outlet for the passage of formulation out of the chamber. The actuating mechanism comprises an actuator and an actuation member. The actuator cooperates with the actuation member such that when a plunger is received in the chamber the plunger and the chamber slide relative to each other in an axial direction by a predetermined incremental distance upon each operation of the actuator to displace a predetermined volume of formulation from the chamber through said outlet.