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This, and regularly inhaling second-hand smoke, could possibly increase the risk of cancer, particularly lymphoma cancer

Some symptoms of depression are: Frequent or constant sadness or anxiety Loss of interest in activities once enjoyed Irritability, frustration, or restlessness Sleep disturbances Changes in appetite Difficulty concentrating, remembering details, or making decisions Excessive tiredness Feelings of guilt, worthlessness or helplessness Thoughts of self-harm or suicide If you suspect depression, you should not depend thoroughly on this information

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Novartis Pharmaceuticals (April 2006)