Secondhand smoke may be a substantial contributor to lead levels found in children and adolescents, new study finds Nicotine Smoking, 'Vaping', and Breastfeeding La Leche League Canada Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Smoking Increases the Risk of SIDS Arkansas Children's Tobacco Smoke, Vaping, and Asthma AAFA.org Secondhand Vaping Poses Hazard to Children Clinical Advisor