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.