A hand-held inhalable vapor producing device, comprising: a cartridge having an opening and containing a liquid; a channel outside of the cartridge that is continuous with the opening and positioned to receive the liquid from the cartridge; and a heat source, the hand-held vapor producing device characterized by: a thermal valve that changes conformation and includes a first metallic layer and a second metallic layer, the second metallic layer having a higher coefficient of thermal expansion than the first metallic layer, the second metallic layer facing the heat source and, upon being heated by the heat source, placing the thermal valve in a second conformation, the thermal valve comprising a rod that seals the opening with the thermal valve in a first conformation and unseals the opening in the second conformation to enable the liquid to flow from the cartridge into the channel; a thermal conducting plate having a plurality of pores and in fluid communication with the channel, the thermal conducting plate configured to receive the liquid from the channel within the plurality of pores; and the heat source being configured to apply heat to the thermal valve and the thermal conducting plate. a cartridge having an opening and containing a liquid; a channel outside of the cartridge that is continuous with the opening and positioned to receive the liquid from the cartridge; and a heat source, the hand-held vapor producing device characterized by: a thermal valve that changes conformation and includes a first metallic layer and a second metallic layer, the second metallic layer having a higher coefficient of thermal expansion than the first metallic layer, the second metallic layer facing the heat source and, upon being heated by the heat source, placing the thermal valve in a second conformation, the thermal valve comprising a rod that seals the opening with the thermal valve in a first conformation and unseals the opening in the second conformation to enable the liquid to flow from the cartridge into the channel; a thermal conducting plate having a plurality of pores and in fluid communication with the channel, the thermal conducting plate configured to receive the liquid from the channel within the plurality of pores; and the heat source being configured to apply heat to the thermal valve and the thermal conducting plate. a thermal valve that changes conformation and includes a first metallic layer and a second metallic layer, the second metallic layer having a higher coefficient of thermal expansion than the first metallic layer, the second metallic layer facing the heat source and, upon being heated by the heat source, placing the thermal valve in a second conformation, the thermal valve comprising a rod that seals the opening with the thermal valve in a first conformation and unseals the opening in the second conformation to enable the liquid to flow from the cartridge into the channel; a thermal conducting plate having a plurality of pores and in fluid communication with the channel, the thermal conducting plate configured to receive the liquid from the channel within the plurality of pores; and the heat source being configured to apply heat to the thermal valve and the thermal conducting plate.