There is provided an inhalation device for delivering a deliverable agent in the form of an aerosol or vapour to a user. The device comprises a solid, porous carrier material having a defined porosity, and a deliverable agent located within the pores of the carrier material. The device is operable to heat the carrier material and vaporise the deliverable agent. Deliverable agents that may be delivered to the user include active pharmaceutical ingredients. Suitable materials for the porous carrier material include chemically bonded ceramic materials and geopolymeric materials.