E Cigarettes Not Helping People Quit Smoking: Study WARNING E cigarettes with nicotine are highly addictive and are harmful to health. Some of their toxic substances are known to cause cancer increase the risk of heart and lung disorders. # E Cigarettes for Immediate Smoking Substitution in Women Diagnosed with Cervical Dysplasia and Associated Disorders E cigarette use among youth in the US declined to the lowest level in a decade CNN