An aerosol generating system comprises a housing having a first portion (22) and a second portion (24). The housing comprises: an air inlet (26 26a 26b) a nicotine source (8) a volatile delivery enhancing compound source(12) and an airoutlet (28). The first portion of the housing and the second portion of the housing are movable relative to one another between an open position and a closed position. In the open position the air inlet and the air outlet are unobstructed and the nicotine source and the volatile delivery enhancing compound source are both in fluid communication with an airflow pathway through the housing between the air inlet and the air outlet. In the closed position either the air inlet is obstructed or the nicotine source and the volatile delivery enhancing compound source are both not in fluid communication with an airflow pathway through the housing between the air inlet and the air outlet or both.
