19:00 31 July 02
The body's own versions of the active ingredient of cannabis could help extinguish unwanted memories, work in mice suggests.
Marijuana has been used medicinally for thousands of years, and people with certain psychiatric conditions such as schizophrenia are more likely to smoke pot than healthy people.
The active chemical in marijuana, tetrahydrocannabinol or THC, binds to the brain's cannabinoid receptors, which are known to be linked to pain sensations, emotion and movement. And in the past decade, researchers have identified chemicals made within the brain that are similar to THC.
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