An aerosol-generating article is provided, including an aerosol-generating substrate including tobacco; and a capacitor including a first electrode, a second electrode, and a dielectric material disposed between the first electrode and the second electrode, the dielectric material including a porous substrate material and a liquid sorbed into the porous substrate material. There is also provided an aerosol-generating system including the aerosol-generating article in combination with an aerosol-generating device.