Vaping at Harvest, a marijuana dispensary, in San Francisco, Oct 8, 2019. A technology initially promoted to help cigarette smokers has transformed marijuana use, too. Now, with cases of severe lung illness rising, health investigators are warning people to stop vaping cannabis. (Jim Wilson/The New York Times)

Health hazards of vaping cannabis

Most of the patients in the outbreak of severe lung illnesses linked to vaping in US, which has left 1,479 people sick and 33 dead, vaped THC