JUUL E Cigarettes Harrison County Health Department Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders. Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Toxicity, Chemistry, and Public Health Relevance of Emerging Nicotine Analog Vapes, Pods, and Pouches Chemical Research in Toxicology