Psychopharmacological effects of cannabis.

The use of cannabis can lead to an acute toxic psychosis, 'flashbacks', depersonalization, derealization and marked cognitive and psychomotor impairment. Further research is needed to establish whether a functional psychosis can be provoked, aggravated or prolonged by cannabis intake. Perhaps of greatest significance among the physical sequelae is the potential to suppress the immune system, impair reproduction, produce respiratory disease and increase the risk of lung cancer.