An electronic cigarette vaporiser that includes an air pressure valve or device to enable excess air to escape from an e-liquid reservoir in the vaporiser during pressurized filling of the vaporizer with e-liquid. If the vaporizer includes a ceramic cell (84), then the air pressure device is the wall of the ceramic cell (84) and the reservoir is the chamber (44) arranged outside of the external wall of the ceramic cell. The air pressure valve or device can be formed out of an air-porous substance that is not porous to e-liquid, and can be oleophobic, hydrophobic or otherwise non-wetting.
