California health officials are warning fans of the popular Red Vines black licorice candy not to eat the treats because they tested positive for high levels of lead. American Licorice Co. of Union City, Calif., issued a voluntary recall Wednesday for 1-pound bags of Red Vines Black Licorice Twists with a best before date of Feb. 4, 2013. It was not clear what volume of product had been recalled. Company officials did not immediately return NBC News calls seeking comment.