A selectively activate-able heating-element system for use with cannabis, tobacco, and e-cig inhalation devices and housings. The selectively activate-able heating-element system includes two-or-more heating-elements, each connected to a ‘；multi-heating-element circuit-switching-element.’； The ‘；multi-heating-element circuit-switching-element’； in simplest form may be a 2 way switch, 3 way switch, 4 way switch, 5 way switch, 6 way switch, 2 or more momentary push buttons, 3 or more momentary pushbuttons, or any other compatible types of user input-able component options, for example, a rotary encoder, graphical user interface operably connected to an integrated circuit and so on. Any ‘；multi-heating-element circuit-switching-element’； must be at least electrically positioned between an electric power source and two-or-more heating-elements, electrically connected to the electric power source and two-or-more heating-elements, and be able to distribute that power to any electrically connected heating-elements upon any users selective interaction with the ‘；multi-heating-element circuit-switching-element.’；
