E cigarettes are not a healthier alternative to cigarettes. They contain nicotine and many harmful ingredients that can cause cancer and heart disease. Since these products are relatively new, we don't know all E Cigarettes and Vape Pens Tobacco Prevention Toolkit Stanford Medicine E Cigs Vapes & Pod Based Tobacco Prevention Toolkit Stanford Medicine E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA Juul to pull popular fruity e cigarette flavors in bid to curb teen use Vaping The Guardian Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis