A simulated cigarette device (1) comprising an elongate housing (3) having an inhaling outlet at one end (5) and a refill inlet. A reservoir (7) extends along a substantial portion of the housing and has a refill valve (6) adjacent to the refill inlet and an outlet valve (9) adjacent to the inhaling outlet, which is operable to allow gas from the reservoir to pass from the reservoir and out of the inhaling outlet. An air flow passage into the housing downstream of the reservoir leads to the inhaling outlet. A valve opening mechanism having a rotatable valve (16,28) is associated with the air flow passage and is arranged to open the outlet valve (9) as air is sucked through the air flow passage.
