*Marijuana
Neurogenesis (birth of neurons) is the process by which neurons are generated,neurogenesis is responsible for populating the growing brain.
http://norml.org/index.cfm?Group_ID=6812
Researchers at the University of Saskatchewan in Saskatoon found that the administration of synthetic cannabinoids in rats stimulated the proliferation of newborn neurons (nerve cells) in the hippocampus region of the brain and significantly reduced measures of anxiety and depression-like behavior. The results shocked researchers — who noted that almost all other so-called “drugs of abuse,” including alcohol and tobacco, decrease neurogenesis in adults — and left the “pot kills brain cells” crowd with a platter of long-overdue egg on their faces. While it would be premature to extrapolate the study’s findings to humans, at a minimum, the data reinforce the notion that cannabinoids are unusually non-toxic to the brain and that even long-term use of marijuana likely represents little risk to brain function. The findings also offer further evidence that cannabinoids can play a role in the alleviation of depression and anxiety, and that cannabis-based medicines may one day offer a safer alternative to conventional anti-depressant pharmaceuticals such as Paxil and Prozac.
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