E-cigarettes are nicotine delivery devices just like cigarettes and smokeless tobacco. They operate by vaporizing the nicotine so that it is ready for inhalation. Electronic cigarettes contain carcinogens and toxic chemicals according to the Food and Drug Administration. France, Canada, Brazil, Panama, Uruguay, and Colombia prohibit the use of e-cigarettes wherever a cigarette ban is in place. As of 2011, the FDA (Food and Drug Administration) has ruled that e-cigarettes are not a medical or a cessation device. They are a nicotine delivery system.
E-cigarettes are prohibited because the impact of their use on secondhand users is not well studied yet. Tobacco is prohibited due to its harmful secondhand impact; e-devices are also prohibited due to toxic substances, such as the propellants that create the vapor in e-cigarettes, regardless of whether the devices also contain tobacco or other drugs. Also, because these devices simulate tobacco use, from a distance it is difficult to ascertain whether they are conventional cigarettes or hookahs or electronic ones. This ambiguity compromises effective enforcement.
Lastly, electronic devices do contain tobacco or other drugs that are prohibited.