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Hank explains the science behind the effects of that wackiest of weeds, cannabis sativa - aka marijuana. Like SciShow on Facebook: http://www.facebook.com/scishow Follow SciShow on Twitter: http://www.twitter.com/scishow Citations http://www.nida.nih.gov/infofacts/marijuana.html http://science.howstuffworks.com/marijuana3.htm http://www.chm ...
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