A recent study from the Centers For Disease Control has found that nearly one-third of mentally ill adults are smokers. In fact, they’re 70 percent more likely to smoke than adults without mental illness. The relationship between cigarettes and mental hospitals is a complicated one. Historically, smoking was common in mental hospitals. It was even used as an incentive for patients at times. Now, more and more treatment facilities are becoming smoke-free. What does this mean for patients who rely on the habit for comfort? Pam Belluck has been writing about these issues. She covers health and science for The New York Times.