Since their introduction, vaping devices have been studied for the numerous potentially harmful chemicals they can introduce into users, including: heavy metals (cadmium, nickel, lead), plastic-related toxic gases (like cyanide and phosgene), volatile organic compounds, ultrafine particles, and diacetyl flavoring (linked to a chronic pulmonary syndrome known as popcorn lung, which is not as appealing as it sounds) 4
Bidis contain more hazardous chemicals and nicotine than cigarettes, and require deeper and more frequent puffs to keep alight
Outside of the US, these printers have been recommended
It wouldn't be like Forever
Furthermore, the larger size of most cigars and longer smoking time result in a more concentrated exposure to many of these toxic substances (also add carbon monoxide, hydrocarbons, ammonia, cadmium, and other wonderful stuff to the list)