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Cigarette smoking and its comorbidity.

Comorbidity is the existence of two conditions in the same individual at a greater frequency than would be expected by chance alone. The existence of such associations says nothing about the underlying cause of the comorbidity. Cigarette smoking in the United States has long been associated with an increased level of psychiatric symptomatology, but until recently this was not thought of in terms of specific diagnostic entities. Cigarette smokers were simply thought more likely to be "nervous" people than nonsmokers (Glassman 1993). However, it is important to realize that the appearance of comorbidity can be strongly influenced by social factors. If everybody smoked, there could be no association between smoking and any psychiatric condition.