Abstract

Every year, like a social drinker who wants to prove to herself that she's not an alcoholic, I give up cannabis for a month. It can be a tough and dreary time - and much as I enjoy a glass of wine with dinner, alcohol cannot take its place. Some people may smoke dope just to relax or have fun, but for me the reason goes deeper. In fact, I can honestly say that without cannabis, most of my scientific research would never have been done and most of my books on psychology and evolution would not have been written. Some evenings, after a long day at my desk, I'll slip into the bath, light a candle and a spliff, and let the ideas flow - that lecture I have to give to 500 people next week, that article I'm writing for New Scientist, those tricky last words of a book I've been working on for months. This is the time when the sentences seem to write themselves. Or I might sit out in my greenhouse on a summer evening among my tomatoes and peach trees, struggling with questions about free will or the nature of the universe, and find that a smoke gives me new ways of thinking about them. Yes, I know there are serious risks to my health, and I know I might be caught and fined or put in prison. But I weigh all this up, and go on smoking grass. For both individuals and society, all drugs present a dilemma: are they worth the risks to health, wealth and sanity? For me, the pay-off is the scientific inspiration, the wealth of new ideas and the spur to inner exploration. But if I end up a mental and physical wreck, I hereby give you my permission to gloat and say: "I told you so". My first encounter with drugs was a joint shared with a college friend in my first term at Oxford. This was at the tail end of the days of psychedelia and flower power - and cannabis was easy to obtain. After long days of lectures and writing essays, we enjoyed the laughter and giggling, the heightened sensations and crazy ideas that the drug seemed to let loose. Then, one night, something out of the ordinary happened - though whether it was caused by the drug, lack of sleep or something else altogether, I don't know..