Since July, a cluster of 15 cases of severe lung problems requiring hospitalization has emerged in the Midwest. All patients were teens or young adults, and all reported recent vaping. As of today, the Wisconsin Department of Health Services (WDHS), in Madison, said it was studying 12 confirmed respiratory cases, and 13 more are under investigation. So far, the affected counties are Dodge, Door, Racine, Walworth, Waukesha, and Winnebago. Patients experienced a plethora of symptoms, the agency reports, including shortness of breath, fatigue, chest pain, cough, anorexia, nausea, diarrhea, and weight loss, with symptoms worsening over days or weeks before requiring admission to hospital. Physicians aren't sure what's causing the severe symptoms but point to a combination of patient age and contents in the e-cigarette vapor as potential factors.