A vaporizer can include a reservoir for holding oil, a chamber for holding vapor, a feeder for feeding oil from the reservoir to the chamber, and a heater for heating oil. A feeder can be configured to feed oil from the reservoir to the chamber by capillary action. A vaporizer can include a plug sealingly coupled to the reservoir and configured to slide relative to at least a portion of the reservoir. A heater can include at least one of a laser, a resistance heater, a wire, a coil, a wire at least partially disposed in a housing, and a combination thereof. A vaporizer can include a controller and can be configured to heat a heater to a first temperature for a first time period, reduce the temperature of the heater, and maintain the heater at a second temperature for a second time period.