Aerosol-generating device comprising: - a cartridge for holding an aerosol-forming substrate, - an atomizer for atomizing aerosol-forming substrate; - a micropump for delivering a fluid, wherein the micropump is arranged between the cartridge and the atomizer and in fluid connection with the cartridge and the atomizer for supplying aerosol-forming substrate from the cartridge to the atomizer, the micropump comprising: two pump chambers having two separate chamber volumes; two actuators , each actuator assigned to one of the two pump chambers for changing a respective chamber volume; each pump chamber provided with at least one inlet valve and at least one outlet valve for establishing a pumping direction; a common inlet and a common outlet , wherein the two pump chambers are arranged in parallel and are in fluid connection with the common inlet and the common outlet , wherein the two pump chambers are in direct fluid communication with the common inlet and with the common outlet , and wherein the actuators are configured to operate in parallel such that a volume change in each of the two pump chambers occurs simultaneously for both pump chambers , and wherein the micropump is configured to produce a flow rate between 1μL/s and 7μL/s. - a cartridge for holding an aerosol-forming substrate, - an atomizer for atomizing aerosol-forming substrate; - a micropump for delivering a fluid, wherein the micropump is arranged between the cartridge and the atomizer and in fluid connection with the cartridge and the atomizer for supplying aerosol-forming substrate from the cartridge to the atomizer, the micropump comprising: two pump chambers having two separate chamber volumes; two actuators , each actuator assigned to one of the two pump chambers for changing a respective chamber volume; each pump chamber provided with at least one inlet valve and at least one outlet valve for establishing a pumping direction; a common inlet and a common outlet , wherein the two pump chambers are arranged in parallel and are in fluid connection with the common inlet and the common outlet , wherein the two pump chambers are in direct fluid communication with the common inlet and with the common outlet , and wherein the actuators are configured to operate in parallel such that a volume change in each of the two pump chambers occurs simultaneously for both pump chambers , and wherein the micropump is configured to produce a flow rate between 1μL/s and 7μL/s. two pump chambers having two separate chamber volumes; two actuators , each actuator assigned to one of the two pump chambers for changing a respective chamber volume; each pump chamber provided with at least one inlet valve and at least one outlet valve for establishing a pumping direction; a common inlet and a common outlet , wherein the two pump chambers are arranged in parallel and are in fluid connection with the common inlet and the common outlet , wherein the two pump chambers are in direct fluid communication with the common inlet and with the common outlet , and wherein the actuators are configured to operate in parallel such that a volume change in each of the two pump chambers occurs simultaneously for both pump chambers , and wherein the micropump is configured to produce a flow rate between 1μL/s and 7μL/s. <EOS>