SMOKING AND MENTAL ILLNESS. “People living with mental illness have a very high rate of smoking … 44.3 percent of all cigarettes in America are consumed by individuals who live with mental illness and/or substance abuse disorders. This means that people living with mental illness are about twice as likely to smoke as other persons.”
http://www.nami.org/Content/NavigationMenu/Hearts_and_Minds/Smoking_Cessation/Smoking_and_Mental_Illness.htm