The link between smoking, depression, and schizophrenia is due, in part, to a causal effect of tobacco use. Findings reveal that smoking increased the risk of schizophrenia and depression. Additionally, depression and schizophrenia increased the likelihood of a person becoming nicotine dependent.
Researchers have discovered a link between teenage tobacco use and an increased risk of psychotic experiences, such as paranoia and hallucinations. They report this may be due, in part, to some shared genetic influences.