House of Lords written question – answered on 4th February 2004.

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Photo of Lord Acton Lord Acton Labour

asked Her Majesty's Government:

Whether the tetrahydrocannabinol (THC) in cannabis can produce a psychotic reaction.

Photo of Lord Warner Lord Warner Parliamentary Under-Secretary, Department of Health, Parliamentary Under-Secretary (Department of Health)

Research suggests that cannabis, especially in high doses, can produce a "toxic psychosis" in individuals who have no history of severe mental illness, and that one constituent delta-9 tetrahydrocannabinol (THC) itself has dose-related effects producing acute symptoms and signs. These resolve themselves once the effect of the drug wears off.

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