This publication aims to present the current knowledge on the impact of nonmedical cannabis use on health.
Policies which influence the levels and patterns of substance use and related harm can significantly reduce the public health problems attributable to substance use, and interventions at the health care system level can work towards the restoration of health in affected individuals.
Cannabis may trigger panic attacks during intoxication and with continued use, it may cause a state similar to dysthymia .  Researchers have found that daily cannabis use and the use of high-potency cannabis are independently associated with a higher chance of developing schizophrenia and other psychotic disorders .  
This information is provided by the Bureau of Substance Abuse Services within the Department of Public Health .
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