A cartridge (1) for an aerosol generating device, comprising a first cavity (13) containing a nicotine source and a second cavity (14) containing a lactic acid source, the first cavity and the second cavity defining an inner space between the cavities and an outer periphery of the cavities; and a susceptor comprising one or more susceptor elements, wherein the susceptor is arranged such that the susceptor is partly positioned in the inner space (16) between the cavities, and partly positioned in the outer periphery of the cavities, the outer periphery of the cavities being a space between the cavity walls and the cartridge walls.