I'm not schizophrenic, but have worked in the mental health field for many years, including psych hospitals. Many schizophrenics are "dually diagnosed", also having addiction issues. IMO they use chemicals to try to self-medicate and sooth their chemically imbalanced brains, brains that are usually filled with even more harsh chemicals (anti-psychotics). This is why they crave drugs including caffeine and nicotine. The schizophrenia causes cravings for caffeine and nicotine, not the other way around. Not trying to defend cigs btw...