Procter & Gamble Co. said on Friday it was voluntarily recalling some dry conditioner and shampoo sprays sold in the United States and Canada from its Pantene and Herbal Essences brands due to the presence of a cancer-causing chemical. The recall also includes products from its Aussie and Waterless brands made in the United States and some discontinued items from its Old Spice and Hair Food brands, in which P&G said it detected “unexpected levels” of benzene, a human carcinogen. Shares in the packaged goods maker, which have risen 15 percent this year, were down 1.1 percent at $159.36 in afternoon trading. P&G did not disclose the number of recalled products, which were distributed through retail and online outlets, but said they represented less than 1 percent of its overall hair care product portfolio. The company said it had not received any reports of adverse events related to the recall, …