New Toxins Found in Smokeless Tobacco
21 New Toxins and Carcinogens Identified in Smokeless Tobacco
WebMD News Archive
Aug. 14, 2009 -- A single pinch of snuff may expose the user to the same
amount of dangerous smoke-related chemicals found in the smoke of five
cigarettes, according to a new study highlighting the harmful effects of
Researchers have identified new toxins and cancer-causing substances in
smokeless tobacco and snuff, in addition to other known carcinogens, such as
Researchers say sales of moist snuff have doubled since the 1980s, and that
many smokeless tobacco users mistakenly believe the products are less hazardous
to their health because they do not expose the user to tobacco smoke.
But their study, presented today at a meeting of the American Chemical
Society, shows some of the most popular smokeless tobacco and snuff brands
contain an additional 21 smoke-related polycyclic aromatic hydrocarbons (PAH),
which are potent toxins and carcinogens.
"This study once again clearly shows us that smokeless tobacco is not safe,"
researcher Irina Stepanov, PhD, of the University of Minnesota at Minneapolis,
says in a news release. "Our finding places snuff on the same list of major
sources of exposure to polycyclic aromatic hydrocarbons as smoking
Smoke Hazards in Smokeless Tobacco
PAH are common environmental contaminants that form as the result of
incomplete burning of carbon-containing materials, such as wood, coal, and fat.
For example, PAH form during the grilling of hamburgers, steaks, and other red
Stepanov says that until recently, researchers thought smokeless tobacco
contained only trace amounts of PAH because the tobacco was not burned when
"Even though smokeless tobacco use does not involve burning, moist snuff is
getting contaminated with PAH during its manufacturing," Stepanov says. She
says a fire-curing process is used to turn tobacco leaves into snuff, which
puts tobacco in direct contact with the smoke of smoldering hardwoods.
Researchers say the levels of PAH found by this study in smokeless tobacco
make them the most prevalent group of carcinogens in moist snuff.
According to the National Cancer Institute, smokeless tobacco contains 28
cancer-causing substances. Oral cancers are linked to use of smokeless tobacco.
Per dose, more nicotine from smokeless tobacco is absorbed than from a
cigarette. Use of smokeless tobacco can also lead to nicotine addiction.