Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Vaping Impairs Vascular Function, Even Without Nicotine, Study Finds Benefits of Vaping vs Smoking HQ Vape & Smoke Shop E cigarette use is linked to higher heart attack risk, especially in former smokers Secondhand vape plumes could form lung damaging radicals American Chemical Society