Health officials in London, Ont., say a high-school-aged youth was on life support after smoking e-cigarettes, but has since recovered.
The Middlesex-London Health Unit says the youth was in the intensive care unit with a severe pulmonary illness.
The vaping-related illness was first reported today and is believed to be the first confirmed case in Canada.
Health officials in the United States have been investigating a mysterious surge of severe breathing illnesses linked to vaping marijuana in recent months.
They have identified 380 confirmed and probable cases in 36 states and one territory, including at least six deaths.
Health Canada has been urging people who vape to watch for symptoms such as a cough, shortness of breath, fatigue, diarrhea, vomiting and chest pain.
Earlier in the day on Wednesday, Ontario health minister, Christine Elliott ordered all public hospitals to report vaping-related cases of severe pulmonary disease.
Elliott says she has become increasingly concerned about the possible health consequences of vaping, especially among young people, but there's a lack of data available in the province to understand the issue.
She says the data will be critical as the government discusses the problem with experts on solutions to the potential dangers of vaping.