A device used for generating a breathable vapor from an herbal substance such as tobacco or medical marijuana. The device features a heater assembly having of a rod shape heating element with the heat diffuser-mixer blades attached, and is mounted in a case component having the shape of a tubular cylinder. The heater assembly and case component are configured so that the rod is centered within the tubular cylinder. An herbal chamber, which accommodates an herbal substance, is rotationally and removably insertable into the case component tubular cylinder. A mouthpiece is attachable to the herbal chamber, with a screen component. When electrical power is applied to the heater assembly, the herbal substance is vaporized. The device may also be configured to function as an e-cigarette or an essential oil vaporizer. Rotating the herbal chamber causes the herbal substance to be redistributed.
