Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Marijuana and Your Lungs: Is Vaping Safe for People with COPD? How to Smoke E Cigarettes Your First Vaping Guide SMOKO E Cigarettes Secondhand vape plumes could form lung damaging radicals American Chemical Society Vaping versus smoking Vaping: What You Should Know Just Think Twice