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They are not a disease or condition, but rather a symptom of one

It helps to reduce cravings and symptoms of tobacco or nicotine withdrawal

Circulation 120 , 16401645 (2009)

Photo warnings included a close-up shot of rotting teeth with the message "Warning: cigarettes cause cancer," and an image of a gaunt, bald, bedridden person juxtaposed with "Warning: smoking can kill you." Text-only warnings followed some Surgeon's General statements, such as "Quitting smoking now greatly reduces serious risks to your health," and "Smoking causes lung cancer, heart disease, emphysema and may complicate pregnancy." With pictures, 40 percent of smokers said they tried to quit during the study, compared with 34 percent of participants who received only text warnings, researchers report in JAMA Internal Medicine