Abstract: An apparatus for conditioning gas carrying a chemical which is released from a mouth of a smoker after being inhaled from a smoking device comprises a housing with a fluidic passageway from an inlet arranged to receive the gas from the smoker's mouth to an outlet arranged to release the gas to an ambient environment. Along the fluidic passageway the apparatus features a chemical recapture stage, which is arranged to permit the gas to flow therethrough, and which is arranged to removably receive a substrate adapted to substantially retain the chemical carried by the gas, so that the gas exiting the chemical recapture stage is substantially devoid of the chemical, which can be reused upon removal of the substrate from the housing.