In February 2022, the World Journal of Oncology published an article by a team of 13 researchers claiming that vapers are about as likely to get cancer as people who smoke traditional cigarettes.
Citing this article, Stanton Glantz, a tobacco-control activist and retired professor of medicine at the University of California, San Francisco, claimed that not only are there "some carcinogens in e-cigarette aerosol," but "now there is also direct evidence that people who use e-cigarettes are at increased risk of some cancers."
