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Cannabis is the world's favourite drug, but also one of the least understood. Can cannabis cause schizophrenia? Is it addictive? Can it lead you on to harder drugs? Or is it simply a herb, an undervalued medicine? 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.

Other episodes for this season

Why Are Thin People Not Fat?
Episode 1 - Why Are Thin People Not F...
Cannabis: The Evil Weed?
Episode 2 - Cannabis: The Evil Weed?
Why Do We Dream?
Episode 3 - Why Do We Dream?
Can We Make a Star on Earth?
Episode 4 - Can We Make a Star on Ear...
The Secret Life of Your Bodyclock
Episode 5 - The Secret Life of Your B...
What's the Problem with Nudity?
Episode 6 - What's the Problem with N...
How to Survive a Disaster
Episode 7 - How to Survive a Disaster
Who Do You Want Your Child to Be?
Episode 8 - Who Do You Want Your Chil...
Why Can't We Predict Earthquakes?
Episode 9 - Why Can't We Predict Eart...
Alan and Marcus Go Forth and Multiply
Episode 10 - Alan and Marcus Go Forth...
How Violent Are You?
Episode 11 - How Violent Are You?