“Harry Potter” star Daniel Radcliffe has denied he’s a pothead after he was photographed smoking what looked like a joint at a London party. The boy-wizard actor insists he was puffing on a hand-rolled cigarette. Radcliffe was pictured on a newspaper front page smoking with a bizarre, comic-looking beard etched on his face. His rep said, “Daniel does smoke the occasional roll-up cigarette, but he was not doing anything more than this.” “Potter” fans have already been rocked by the clean-cut star’s nude turn on Broadway in “Equus,” and his admission that he likes cougars. But enjoying the magical weed apparently would have been a step too far. The incident comes months after Radcliffe’s “Potter” co-star, Jamie Waylett, who plays Vincent Crabbe, admitted that he grew cannabis plants and was ordered to do 120 hours of community service.