A control device for an electronic aerosol provision system is provided. The control device is configured to receive a replaceable component to form an electronic aerosol provision system. The control device includes a communication interface for performing communications external to the electronic aerosol provision system; a memory configured to hold a set of stored identifiers; and a control system. The control system is configured to: receive control information from a remote server via the communication interface; update the set of stored identifiers based on the control information received from the remote server; receive an identifier from a replaceable component received by the control device; make a comparison of the received identifier against the set of stored identifiers; and perform a control action for the electronic aerosol provision system dependent upon the result of said comparison.