WHO cancer agency on smoking

The International Agency for Research on Cancer has reviewed all published evidence related to tobacco smoking and cancer, both active and involuntary. “While its conclusions unsurprisingly confirm the cancer-causing effects of active smoking, which an earlier working group had considered back in 1986, it also concludes its evaluation of the carcinogenic risks associated with involuntary smoking, with second-hand smoke also classified as carcinogenic to humans,” said the IARC.