Hundreds more vapers have been reported with breathing illness. The death toll rose to 13, the Centers for Disease Control and Prevention confirmed. Probable cases are up 52% from the 530 reported a week ago. Illnesses have occurred in almost every state. No deaths were reported in Lexington County. Health officials began noting reports of people developing severe breathing illnesses. Their lungs apparently reacted to a caustic substance. The only common factor in the illnesses was that they had vaped. The CDC’s count includes only illnesses that met certain criteria. Other illnesses are being investigated. Most vapers said they vaped products containing THC, the ingredient that produces a marijuana high. The investigation has focused on products containing THC and marijuana oil. Some victims said they vaped only nicotine. Health officials advise to avoid any vaping product until the cause is found.