Disclosed is an article for use with apparatus for heating smokable material to volatilise at least one component of the smokable material. The article comprises a cavity for receiving smokable material, a coil of heating material that is heatable by penetration with a varying magnetic field to heat the cavity and the smokable material received in the cavity. Also disclosed is a system comprising the article and apparatus. The apparatus has an interface for cooperating with the article, and a magnetic field generator. The magnetic field generator comprises a coil for generating a varying magnetic field for penetrating the coil of the article when the interface is cooperating with the article. An impedance of the coil of the magnetic field generator is equal, or substantially equal, to an impedance of the coil of the article.