According to a study published in the Journal of The National Cancer Institute (January 2000), smokers may be getting twice the amount of tar and nicotine from low-tar cigarettes than previously thought. "Low tar" cigarettes may carry specific health risks and be related to dramatic increases in a previously rare form of lung cancer, Aden carcinoma. Whereas the cigarette smoke from the high tar cigarettes smoked in earlier decades was too irritating to inhale very deeply, smokers of low tar cigarettes puff more intensely, delivering more carcinogens and toxins to the peripheral lung area where Aden carcinoma develops.