An apparatus, comprising: an entrainment chamber including a medicament reservoir portion configured to receive a liquid medicament, the entrainment chamber defining an entrainment volume , the entrainment chamber including a gas inlet port and an outlet port , the gas inlet port configured to fluidically couple a gas source to the entrainment volume , the entrainment chamber configured such that a flow of a gas within the entrainment volume mixes with the liquid medicament to produce a first aerosol flow at the outlet port ; a nozzle in fluidic communication with the outlet port of the entrainment chamber , the nozzle configured to accelerate the first aerosol flow; a particle selection chamber including an inlet port in fluidic communication with the nozzle and a plurality of sidewalls defining a selection volume , the particle selection chamber configured to receive the first aerosol flow from the nozzle and divert a portion of the liquid medicament therein to produce a second aerosol flow, the particle selection chamber including a tortuous flow path within the selection volume, the tortuous flow path configured to remove aerosol particles in the first aerosol flow such that a volumetric median diameter of the second aerosol flow is less than a volumetric median diameter of the first aerosol flow; and a recirculation port defining at least a portion of a pathway from the particle selection chamber to the medicament reservoir portion of the entrainment chamber , the recirculation port configured such that a portion of the liquid medicament flows from the particle selection chamber to the medicament reservoir portion. an entrainment chamber including a medicament reservoir portion configured to receive a liquid medicament, the entrainment chamber defining an entrainment volume , the entrainment chamber including a gas inlet port and an outlet port , the gas inlet port configured to fluidically couple a gas source to the entrainment volume , the entrainment chamber configured such that a flow of a gas within the entrainment volume mixes with the liquid medicament to produce a first aerosol flow at the outlet port ; a nozzle in fluidic communication with the outlet port of the entrainment chamber , the nozzle configured to accelerate the first aerosol flow; a particle selection chamber including an inlet port in fluidic communication with the nozzle and a plurality of sidewalls defining a selection volume , the particle selection chamber configured to receive the first aerosol flow from the nozzle and divert a portion of the liquid medicament therein to produce a second aerosol flow, the particle selection chamber including a tortuous flow path within the selection volume, the tortuous flow path configured to remove aerosol particles in the first aerosol flow such that a volumetric median diameter of the second aerosol flow is less than a volumetric median diameter of the first aerosol flow; and a recirculation port defining at least a portion of a pathway from the particle selection chamber to the medicament reservoir portion of the entrainment chamber , the recirculation port configured such that a portion of the liquid medicament flows from the particle selection chamber to the medicament reservoir portion. <EOS>