A severe lung illness from vaping has become a public health outbreak resulting in more than two thousand cases and roughly 1-2 deaths per week. Here’s what we know: (1) Products containing THC, particularly those obtained off the street or from friends, family members, or illicit dealers, are linked to most of the cases and play a major role in the outbreak. (2) Refraining from vaping is strongly recommended until the investigation is complete. For those who choose to vape THC, products should only be purchased from a licensed cannabis retailer.