Dr. Sanford Barsky, co-author of the study and a member of the University of California, Los Angeles' Jonnson Comprehensive Cancer Center, said he was not surprised by the findings. He said any substance that is inhaled, regardless of chemical makeup, releases carcinogens into the lungs and throat.
http://www.cnn.com/HEALTH/9808/18/marijuana.cancer/
Carcinogen refers to any substance, radionuclide or radiation that is an agent directly involved in the promotion of cancer or in the fatation of its propagation. This may be due to ability to damage the genome or to the disruption of cellular metabolic processes. Several radioactive substances are considered carcinogens, but their carcinogenic activity is attributed to the radiation, for example gamma rays and alpha particles, which they emit. Common examples of carcinogens are inhaled asbestos, certain dioxins, and tobacco smoke.
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