Vaping vs Smoking : Which Is Safer? Greet Vape UK Vaping exposes user to harmful levels of particulate matter, study suggests CUNY Graduate School of Public Health & Health Policy Vaping: The Small Habit That Hits Harder Than You Think Maryland Physicians Care No, there's still no evidence e cigarettes are as harmful as smoking Science The Guardian E cigarettes and Vaping Commercial Tobacco Use MN Dept. of Health