There are 4,000 chemicals in a cigarette; 60 of these cause cancer and include insecticide, car battery fluid, arsenic poison & hydrogen cyanide. They also produce tar a sticky brown substance Cardiovascular effects of electronic cigarettes Nature Reviews Cardiology Unmasking Ohio's youth tobacco crisis: The dangerous allure of vaping and e cigarettes Sunset Vape JUUL manufacturers aren't required to disclose their ingredients. Cartridges or pods may contain arsenic, formaldehyde, rubidium, benzaldehyde, cadmium and or lithium. Scientists are still working to understand more fully the health