Vaping is often marketed as a safer alternative to smoking, but many vape products contain nicotine, harmful chemicals, and heavy metals that can harm developing brains and lungs. Frontiers The Impact of Nicotine and e Cigarettes on Mental Health Health impacts of electronic cigarettes ANU National Centre for Epidemiology and Population Health Heated Tobacco Products, Cigarettes, and E Cigarettes: What's the Difference PMI Science La cigarette lectronique PMI France FR