US health officials are investigating what might be causing hundreds of serious breathing illnesses in people who use e-cigarettes and other vaping devices. They have identified about 450 possible cases in 33 US states, including six deaths.A look at what we know so far about the outbreak as the investigation continues:What are the symptoms?Patients are coming into hospitals with cough, chest pain, shortness of breath, fatigue and vomiting.How serious are these illnesses?Many of the reports…
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