Wedgwood now enrolled as a doctoral candidate at the Sorbonne, combining his studies with experiments at the works of a celebrated organ builder and activities at Russian Orthodox and Old Catholic churches. It was also in Paris that he became addicted to cocaine, which he used in quantity, smuggling it into England on his visits concealed in the head of his bishop's crozier. It was also in Paris that the symptoms of secondary syphilis manifested themselves – he had contracted the disease as the result of oral sex in Sydney but had refused to admit the fact or to take any treatment.