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Vaporization devices and methods of operating them. In particular, described herein are methods for controlling the power applied to a resistive heater of a vaporization device by measuring the resistance of the resistive heater at discrete intervals. Changes in the resistance during heating may be

Vaporization devices and methods of operating them. In particular, described herein are methods for controlling the power applied to a resistive heater of a vaporization device by measuring the resistance of the resistive heater at discrete intervals. Changes in the resistance during heating may be used to control the power applied to heat the resistive heater during operation. Also described herein are vaporization devices that are configured to measure the resistance of the resistive heater during heating and to control the application of power to the resistive heater based on the resistance values.

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1. A cartridge for a vaporization device, the cartridge comprising: a flattened body having a long axis and a short axis;a reservoir configured to hold a vaporizable material within the flattened body;a heater chamber at an end of the cartridge;a resistive heater comprising a pair of plates on a fir

1. A cartridge for a vaporization device, the cartridge comprising: a flattened body having a long axis and a short axis;a reservoir configured to hold a vaporizable material within the flattened body;a heater chamber at an end of the cartridge;a resistive heater comprising a pair of plates on a first side and a second side of the heater chamber extending in the long axis and a wick suspended between the plates extending in the long axis, and a resistive heating element directly in contact with the pair of plates and with the wick, wherein the wick is configured to contact the vaporizable material from the reservoir; anda pair of exposed flat contact tabs integrally formed from the plates and extending from the resistive heater and folded over an outer surface of the end of the cartridge and configured to complete a circuit with the vaporization device when the cartridge is inserted into the vaporization device. 2. The cartridge of claim 1, wherein the pair of exposed contact tabs are configured to mate with a pair of electrical contacts in a cartridge receptacle of the vaporization device to complete the circuit. 3. The cartridge of claim 1, wherein the pair of exposed contact tabs are configured to mate with a pair of electrical contacts comprising pogo pins in a cartridge receptacle of the vaporization device to complete the circuit. 4. The cartridge of claim 1, wherein the resistive heating element is wound around the wick. 5. The cartridge of claim 1, wherein the resistive heater comprises a condensation chamber. 6. The cartridge of claim 1, further comprising a protective cap. 7. The cartridge of claim 1, wherein the resistive heater encloses a first end of the cartridge. 8. The cartridge of claim 1, further comprising a mouthpiece. 9. The cartridge of claim 1, further comprising a mouthpiece fitted onto the reservoir. 10. The cartridge of claim 1, further comprising a mouthpiece coupled with a snap-fit coupling. 11. The cartridge of claim 1, further comprising an air inlet passage. 12. The cartridge of claim 1, further comprising a channel integral to an exterior surface, wherein the channel forms a first side of an air inlet passage. 13. The cartridge of claim 1 wherein the resistive heating element is attached to the pair of plates on the first and second sides of the heater chamber. 14. A cartridge for a vaporization device, the cartridge comprising: a flattened body having a long axis and a short axis;a reservoir holding a liquid vaporizable material within the flattened body;a heater chamber at a distal end of the flattened body;a resistive heater comprising a pair of plates on a first side and a second side of the heater chamber extending in the long axis and a wick suspended between the plates, and a resistive heating element directly in contact with the pair of plates and in thermal contact with the wick, wherein the wick contacts the vaporizable material in the reservoir;a pair of exposed flat contact tabs integrally formed from the plates and extending from the resistive heater and folded over an outer surface of the distal end of the flattened body and configured to complete a circuit with the vaporization device when the cartridge is inserted into the vaporization device; anda raised rail on each side of the flattened body. 15. A cartridge for a vaporization device, the cartridge comprising: a flattened body having a long axis and a short axis;a reservoir holding a liquid vaporizable material within the flattened body;a heater chamber at a distal end of the flattened body;a resistive heater comprising a pair of plates on a first side and a second side of the heater chamber extending in the long axis, and a wick suspended between the plates at the distal end of the flattened body, and a resistive heating element directly in contact with the pair of plates and in thermal contact with the wick, wherein the wick contacts the vaporizable material in the reservoir;a pair of exposed flat contact tabs integrally formed from the plates and extending from the resistive heater and folded over an outer surface of the distal end of the flattened body and configured to complete a circuit with the vaporization device when the cartridge is inserted into the vaporization device; anda mouthpiece fitted onto the reservoir and having a notch providing a view of into the reservoir. 16. A cartridge for a vaporization device, the cartridge comprising: a flattened body having a long axis and a short axis;a reservoir holding a liquid vaporizable material within the flattened body;a heater chamber at a distal end of the flattened body;a resistive heater comprising a pair of plates on a first side and a second side of the heater chamber extending in the long axis, and a wick suspended between the plates at the distal end of the flattened body, and a resistive heating element directly in contact with the pair of plates and in thermal contact with the wick, wherein the wick contacts the vaporizable material in the reservoir;a pair of exposed flat contact tabs integrally formed from the plates and extending from the resistive heater and folded over an outer surface of the distal end of the flattened body and configured to complete a circuit with the vaporization device when the cartridge is inserted into the vaporization device;a mouthpiece fitted onto the reservoir and having a notch providing a view of into the reservoir; anda raised rail on each side of the flattened body.