Electronic cigarettes come in a variety of designs. Some are sold with filled cartridges, while others are designed so that users can add a solution that's purchased separately. The solutions typically contain vegetable glycerin or propylene glycol as the main ingredients, varying amounts of nicotine, flavorings and other additives.
Are e-cigarettes safe?
There's no scientific evidence that using e-cigarettes is safe.
Because e-cigarettes don't burn tobacco, most experts agree that they're likely to cause fewer harmful effects than traditional cigarettes. Most e-cigarette manufacturers claim that their products are a safe alternative to conventional cigarettes. However, the Food and Drug Administration (FDA) has questioned the safety of these products.
Researchers have found that some e-cigarettes have nicotine amounts that are very different from what's on the label. In addition, some flavoring agents and other additives have been shown to be toxic.
The long-term health effects of inhaling vegetable glycerin, propylene glycol and other additives are not known. The FDA and many health care organizations, including the American Heart Association, have issued warnings about the health risks of e-cigarettes.