A vaporizing device with two concentric tubes for volatizing and inhaling one or more constituents of various vaporizable substances, such as medicines and plant materials. Devices may be successfully operated using the flame from a standard butane cigarette lighter or the like as the sole heat source. Concentric tubes, an inner tube with two open ends and an outer tube with one closed end provide a serpentine pathway for an airflow. An additional embodiment of the device provides a substitute for a standard slider-bowl allowing for the conversion of a standard water pipe into a vaporizing device. Other embodiments allow for vaporization of cigarettes.