Dr Robin Carhart-Harris, a research associate in the Centre for Neuropsychopharma-cology at Imperial College, is ... the first person in the UK to have legally administered doses of lysergic acid diethylamide (LSD) to human volunteers since the Misuse of Drugs Act of 1971. Born in Durham 33 years ago and raised in Bournemouth, he ... is a careful and articulate speaker, but his enthusiasm for his work is evident. We're at an early, but certainly promising, stage. It's really exciting," he says. The potential scientific benefits of psychedelics ... fall broadly into two categories. They look like being medicinally or therapeutically useful, and they offer an unconventional view of the workings of the human mind, such that the age-old, so-called "hard problem of consciousness" might be made a little easier. Uniquely potent in minute doses, and with what Carhart-Harris calls "a very favourable physiological safety profile" - which is to say, it is non-toxic - this newly synthesised psychedelic drug opened new doors, in more ways than one. "You could say the birth of the science of psychedelics occurred with the discovery of LSD," says Carhart-Harris. "It was only then that we started to study them systematically." Cary Grant famously used it during his therapy, as did the Alcoholics Anonymous co-founder Bill Wilson. Between the 1950s and 1965, when Sandoz withdrew the drug, there were more than 1,000 clinical papers discussing 40,000 patients. A 2012 meta-analysis of six controlled trials from the era found its clinical efficiency for the treatment of alcohol addiction to be as effective as any treatment developed since.