Usain Bolt has told a German tabloid newspaper that he used marijuana when he was a teen.

The German tabloid Bild reported yesterday that the Jamaican sprint phenomenon used the recreational drug during his formative years, but he has not touched it since.

"When you're a child in Jamaica, you learn how to roll a joint," he said. "Everyone tried marijuana, including me, but I was really young."

He added: "Nobody in my family or those close to me smoke and I don't hang out with people who smoke."

The 22-year-old Bolt, holder of the world records for the men's 100 and 200 metres set last year at the Olympic Games in China, again rejected suggestions of doping.

"People can say what they want, I know I'm clean," he said. "That's the only thing that counts, not what other people say.

"I was subject of so many anti-doping tests during the Olympic year, between 30 and 40."

With the World Championships set for Berlin in August, Bolt has his sights set on winning three gold medals again as he did in Beijing in the 100, 200 and men's 4x100 relay.