An aerosol medicament delivery adapter, comprising: a first conduit that comprises a flow path conduit enclosing a cylindrical flow path chamber having (i) a first radial cross-sectional dimension and (ii) a first principal axis, extending between a first end that corresponds to an upstream end and a second end that corresponds to a downstream end; a second conduit that comprises an aerosol medicament delivery conduit enclosing a cylindrical aerosol delivery chamber having (i) a second radial cross-sectional dimension and (ii) a second principal axis, extending between a first end that corresponds to an upstream end and a second end that corresponds to a downstream end of the second conduit, wherein the first end of the second conduit is adapted to be fluidly coupled to a nebulizer, and wherein the second end of the second conduit is fluidly coupled to the first conduit at a Y-junction proximate the first end of the first conduit; and a diverter element that comprises a cylindrical flow diverter chamber disposed within at least one of the first conduit and the second conduit, wherein the cylindrical flow diverter chamber includes (a)(i) a transitional flow cross-section and (a)(ii) a third principal axis, extending between a first end and a second end of the cylindrical flow diverter chamber, wherein the transitional flow cross-section of the cylindrical flow diverter chamber includes a flow path cross-section perpendicular to the third principal axis that transitions from (b)(i) a first cross-section of a third radial cross-sectional dimension at the first end of the cylindrical flow diverter chamber to (b)(ii) a second cross-section that comprises a compound cross-section that includes a first portion with the third radial cross-section dimension and a second portion with a cross-sectional dimension determined by a flow diverter transition surface at the second end of the cylindrical flow diverter chamber, wherein the second end of the cylindrical flow diverter chamber is fluidly coupled (c)(i) within the first conduit proximate the first end of the first conduit, upstream of the second conduit or (c)(ii) within the second conduit downstream of the nebulizer at, or proximate to, the Y-junction, wherein responsive to a pressurized gas flow along a flow path within the first conduit in a downstream direction, the diverter element creates flow eddies for enhancing an entrainment of aerosol particles, delivered via the second conduit, within the pressurized gas flow along the flow path within the first conduit. a first conduit that comprises a flow path conduit enclosing a cylindrical flow path chamber having (i) a first radial cross-sectional dimension and (ii) a first principal axis, extending between a first end that corresponds to an upstream end and a second end that corresponds to a downstream end; a second conduit that comprises an aerosol medicament delivery conduit enclosing a cylindrical aerosol delivery chamber having (i) a second radial cross-sectional dimension and (ii) a second principal axis, extending between a first end that corresponds to an upstream end and a second end that corresponds to a downstream end of the second conduit, wherein the first end of the second conduit is adapted to be fluidly coupled to a nebulizer, and wherein the second end of the second conduit is fluidly coupled to the first conduit at a Y-junction proximate the first end of the first conduit; and a diverter element that comprises a cylindrical flow diverter chamber disposed within at least one of the first conduit and the second conduit, wherein the cylindrical flow diverter chamber includes (a)(i) a transitional flow cross-section and (a)(ii) a third principal axis, extending between a first end and a second end of the cylindrical flow diverter chamber, wherein the transitional flow cross-section of the cylindrical flow diverter chamber includes a flow path cross-section perpendicular to the third principal axis that transitions from (b)(i) a first cross-section of a third radial cross-sectional dimension at the first end of the cylindrical flow diverter chamber to (b)(ii) a second cross-section that comprises a compound cross-section that includes a first portion with the third radial cross-section dimension and a second portion with a cross-sectional dimension determined by a flow diverter transition surface at the second end of the cylindrical flow diverter chamber, wherein the second end of the cylindrical flow diverter chamber is fluidly coupled (c)(i) within the first conduit proximate the first end of the first conduit, upstream of the second conduit or (c)(ii) within the second conduit downstream of the nebulizer at, or proximate to, the Y-junction, wherein responsive to a pressurized gas flow along a flow path within the first conduit in a downstream direction, the diverter element creates flow eddies for enhancing an entrainment of aerosol particles, delivered via the second conduit, within the pressurized gas flow along the flow path within the first conduit.