E cigarettes: 'cancer risk close to zero' Bhekisisa 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 Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders. A comparison of the major toxins and adverse health effects of smoking Download Scientific Diagram