Truth Initiative Secondhand smoke is classified as a Group A carcinogen, a substance known to cause #cancer in humans and animals. Learn more at the link in Instagram Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Is Vaping Better Than Smoking? American Heart Association In secondhand vape, scientists smell risk American Heart Association Harmful When Pregnant What Harm Does Second hand Fumes From Vaping Cause To Young Lungs? Medical Experts Want To Know Raleigh Durham Australia Second hand Smoke World Of Goo Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice