An estimated 4.6 million Canadians have tried vaping at least once.1 Media attention has focussed on the health risks of recreational vaping among teenagers and recent cases of lung injury caused by using illicit cannabis oil preparations in vaporizers.2 Some vapers are smokers who are using vaping as a more effective way to quit smoking.3 There has been little research on the interaction between vaping and anesthesia.4 Anesthesiologists need more information to guide the preoperative evaluation of patients who vape, manage a vaper on the day of surgery, and provide appropriate postoperative care for vapers.