Compared with traditional cigarettes, electronic cigarettes can seem simple and harmless. After all, they trade the eye-stinging smoke of burning tobacco leaves for something that looks like steam and might smell like air freshener. But that aroma masks a complex chemical mix that definitely worries experts who study the ingredients and effects of e-cigarettes, or […] The post What’s in a vape? Why e-cigarettes are hardly harmless appeared first on Knowridge Science Report .