Schizophrenia
More people with schizophrenia smoke tobacco than the general population; it is estimated that at least 60% to as many as 90% of people with schizophrenia smoke tobacco. Recent research suggests that cigarette smoking may be a risk factor for developing schizophrenia. Smoking also reduces the effects and side effects of anti-psychotic drugs, and this may be one of the reasons for the high smoking rate. Patients taking anti-psychotic drugs die up to 20 years earlier than others, possibly because the medication makes them overweight, gives diabetes and leads to them smoking.