“In England, it's a rare thing to see a player smoking but, all in all, I prefer that to an alcoholic. The relationship with alcohol is a real problem in English football and, in the short term, it's much more harmful to a sportsman. It weakens the body, which becomes more susceptible to injury.”

“Your brain is built of cells called neurons and glia - hundreds of billions of them. Each one of these cells is as complicated as a city.”