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Many cigarette smokers wake in the night, smoke, and then return to sleep. Prior research has linked this behavior to smoking a higher number of cigarettes each day and to a higher likelihood of failing when trying to quit smoking. In recent years, some researchers began to propose that waking to smoke is a symptom of nicotine dependence. New research from Penn State, however, suggests that waking in the night is more likely the result of stress than nicotine addiction. [...]