Psychological and social factors influencing quality of life during treatment in active breast cancer patients and psychological interventions: a systematic review.

Recent research suggests that the number of psychosis cases associated with cannabis use has increased in the last two decades (, ). The increase coincides with an increase in concentrations of delta-9 tetrahydrocannabinol in cannabis well above 10% THC (, ). Here we report cases of cannabis-associated violence that were first identified by reports in the media. Authors generated a list of violence cases, and further investigation was done using internet searches of media reports to determine if cannabis use was thought to be involved and if the perpetrators showed symptoms of psychosis. Attempts were made through the Freedom of Information Act to obtain toxicology results. Early cases were mostly located in Colorado, the first US state to legalize retail cannabis. However, now such cases are reported more broadly across the US. There is some commonality in many of the violence cases. Family members and friends often reported that there was a change in the perpetrator’s behavior and thinking over time, including paranoid ideations, delusions, or auditory hallucinations. Often the behavior includes relieving themselves of clothing and appearing naked. Common themes involve use of guns, edged weapons, severe interpersonal violence, or other homicidal behavior. The violent act is frequently unanticipated, with individuals acquainted with the perpetrator expressing disbelief that he or she could have engaged in such behavior. includes media-reported cases of significant violence where THC is the only drug present in toxicology or there is a diagnosis of psychosis. includes media-reported cases of violent behavior where testing for THC was not done or not reported, despite evidence that the perpetrator had been using cannabis. Cases of Significant Unexpected Violence Where THC Was the Only Drug in Toxicology.