People often think that smoking cannabis makes them more creative. However, research by Leiden University psychologists Lorenza Colzato and Mikael Kowal in the Netherlands shows that the opposite is true. They published their findings in Psychopharmacology.

The findings show that cannabis with a high concentration of the psychoactive ingredient THC does not improve creativity. A high dose of THC was actually shown to have a negative effect on the ability to quickly come up with as many solutions as possible to a given problem. 

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