Bigger and more real issue is the invention of cheap and readily accessible man made hard drugs. The increased rates of mental illness is more a symptom of rampant hard drug addiction rather than a cause. Illicit drug use has skyrocketed since the early 20th century and just keeps increasing every decade, thus so does the rate of mental illness. The real solution is eliminate hard drugs. Incarceration and mandatory rehab is necessary to protect the public from the drug addict.