The science is my passion, the policy work my social duty. I think there's no other issue in the world that causes such suffering and which could be improved simply by rethinking. Millions of people are in jail just because they used consciousness-altering substances without causing any harm to others. I think it is an affront to human rights and dignity. What you do with your consciousness is your own business.

I was introduced to cannabis when I was 16. I realized the similarity to the mystical experiences I'd had - the enhancing of senses, the way it made thought more interesting. In 1965, before it became illegal, I was introduced to LSD. I thought it was extraordinary.

I've always been an outsider. I grew up in an isolated house surrounded by three moats. There was no money. I left school early. It was a world of its own. I became fascinated by consciousness because there was nothing much to do except mooch about and think. I had the occasional mystical experience. I studied consciousness, reading all the books I could get.

The science is my passion, the policy work my social duty. I think there's no other issue in the world that causes such suffering and which could be improved simply by rethinking. Millions of people are in jail just because they used consciousness-altering substances without causing any harm to others. I think it is an affront to human rights and dignity. What you do with your consciousness is your own business.