Abstract: Gas recirculation systems for use in endoscopic surgical procedures including a gas recirculation pump are disclosed. The gas recirculation pump may work in conjunction with an insufflator used to inflate a patient's peritoneal cavity during surgery. The gas recirculation system may recirculate a flow of gas from and to the patient, based on a detected amount of smoke in the gas, while filtering particulate matter out of the gas and while maintaining an adequate moisture content in the gas. A controller may adjust the speed of a pump motor based on the detected amount of smoke, and may also open a suction exhaust path to vent gas and smoke if the amount of smoke detected exceeds a threshold.