An electronic cigarette vaporiser system, or e-cig, includes a piezo-electric pump (6) with multiple piezo-actuators, in which a microcontroller independently adjusts the phase or timing or power of each voltage pulse that triggers a piezo-actuator. The microcontroller continuously or regularly monitors the efficiency or performance of the entire pump (6) and adjusts the phase, timing, or power delivered to each piezo-actuator relationship until or so that the optimum pumping performance is achieved. The pumping is monitored by a flow sensor such as a MEMS flow sensor. The piezo-actuators sending less e-liquid will receive greater power supplied than the actuators sending more.
