Of the 7,000 constituents of cigarette smoke, 93 in particular are quite toxic, said Dr. Kurt M. Ribisl of the Lineberger Comprehensive Cancer Center at the University of North Carolina, Chapel Hill.

And because they’re unregulated, you don’t necessarily know what’s in them. In 2009, the FDA detected diethylene glycol, a toxic chemical used in antifreeze, in some e-cig samples and ...

What's in a cigarette? FDA to study ingredients . ... File photo / AP, 2009 A customer at the Red Key Taven in Indianapolis lights a cigarette in this photo from June 11, 2009.

(Reuters Health) – Many people in a recent study said they’d tried to find out what chemicals are in tobacco products or smoke, but most were not familiar with components other than nicotine.