Addiction specialist Dr John Marsden discovers that modern science is finally beginning to find answers to these questions. John traces the cannabis plants' birthplace in Kazakhstan; finds the origins of our sensitivity to cannabis in the simple sea squirt; and finds out just what it does to our brains.
He meets people who have been changed by this drug in drastically different ways - from those whose lives have been shattered to those who lives have been revived.More documentaries like this...
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