An aerosol-generating system comprising: an aerosol-generating device in cooperation with an aerosol-generating article; the aerosol-generating article comprising: a first sealed compartment comprising a tubular porous element and a delivery enhancing compound sorbed on the tubular porous element; and a second compartment comprising a volatile liquid, the aerosol-generating device comprising: an outer housing adapted to receive the aerosol-generating article; an elongate piercing member for piercing the first compartment and the second compartment of the aerosol-generating article, wherein, the elongate piercing member comprises: a piercing portion adjacent a distal end of the elongate piercing member; a shaft portion; and an obstructing portion adjacent a proximal end of the elongate piercing member; wherein, the piercing portion has a maximum diameter greater than the diameter of the shaft portion, and the obstructing portion has an outer diameter such that it fits within the tubular porous element of the article when the aerosol-generating article is received in the aerosol-generating device. an aerosol-generating device in cooperation with an aerosol-generating article; the aerosol-generating article comprising: a first sealed compartment comprising a tubular porous element and a delivery enhancing compound sorbed on the tubular porous element; and a second compartment comprising a volatile liquid, a first sealed compartment comprising a tubular porous element and a delivery enhancing compound sorbed on the tubular porous element; and a second compartment comprising a volatile liquid, the aerosol-generating device comprising: an outer housing adapted to receive the aerosol-generating article; an elongate piercing member for piercing the first compartment and the second compartment of the aerosol-generating article, wherein, the elongate piercing member comprises: a piercing portion adjacent a distal end of the elongate piercing member; a shaft portion; and an obstructing portion adjacent a proximal end of the elongate piercing member; wherein, the piercing portion has a maximum diameter greater than the diameter of the shaft portion, and the obstructing portion has an outer diameter such that it fits within the tubular porous element of the article when the aerosol-generating article is received in the aerosol-generating device. an outer housing adapted to receive the aerosol-generating article; an elongate piercing member for piercing the first compartment and the second compartment of the aerosol-generating article, wherein, the elongate piercing member comprises: a piercing portion adjacent a distal end of the elongate piercing member; a shaft portion; and an obstructing portion adjacent a proximal end of the elongate piercing member; wherein, the piercing portion has a maximum diameter greater than the diameter of the shaft portion, and the obstructing portion has an outer diameter such that it fits within the tubular porous element of the article when the aerosol-generating article is received in the aerosol-generating device. a piercing portion adjacent a distal end of the elongate piercing member; a shaft portion; and an obstructing portion adjacent a proximal end of the elongate piercing member; wherein, the piercing portion has a maximum diameter greater than the diameter of the shaft portion, and the obstructing portion has an outer diameter such that it fits within the tubular porous element of the article when the aerosol-generating article is received in the aerosol-generating device.